diff --git a/spec/helpers/matchers_helper.cr b/spec/helpers/matchers_helper.cr
index e16ca66..2f123df 100644
--- a/spec/helpers/matchers_helper.cr
+++ b/spec/helpers/matchers_helper.cr
@@ -1,6 +1,6 @@
 # Retrieves a value from match data given its key/label.
-def match_data_value_with_key(match_data, key)
-  labeled_value = match_data.values.find { |v| v.label == key }
+def match_data_value_with_key(match_data_values, key)
+  labeled_value = match_data_values.find { |v| v.label == key }
   raise "#{key} is missing" unless labeled_value
   labeled_value.value
 end
@@ -8,17 +8,13 @@ end
 # Retrieves the string representation and base value
 # from a `Spectator::Matchers::PrefixedMatchDataValue` (or similar)
 # in the values returned by `Spectator::Matchers::MatchData#values`.
-def match_data_value_sans_prefix(match_data, key)
-  prefix = match_data_value_with_key(match_data, key)
-  if prefix.responds_to?(:value)
-    {to_s: prefix.to_s, value: prefix.value}
-  else
-    {to_s: prefix.to_s, value: prefix}
-  end
+def match_data_value_sans_prefix(match_data_values, key)
+  prefix = match_data_value_with_key(match_data_values, key)
+  {to_s: prefix.to_s, value: prefix.value}
 end
 
 # Check whether match data has a value with a specified key/label.
-def match_data_has_key?(match_data, key)
-  found = match_data.values.find { |v| v.label == key }
+def match_data_has_key?(match_data_values, key)
+  found = match_data_values.find { |v| v.label == key }
   !!found
 end
diff --git a/spec/matchers/attributes_matcher_spec.cr b/spec/matchers/attributes_matcher_spec.cr
index b426496..36bedc5 100644
--- a/spec/matchers/attributes_matcher_spec.cr
+++ b/spec/matchers/attributes_matcher_spec.cr
@@ -249,9 +249,9 @@ describe Spectator::Matchers::AttributesMatcher do
           partial = new_partial(array)
           matcher = Spectator::Matchers::AttributesMatcher.new(attributes)
           match_data = matcher.match(partial)
-          match_data_has_key?(match_data, :"expected first").should be_true
-          match_data_has_key?(match_data, :"expected last").should be_true
-          match_data_has_key?(match_data, :"expected size").should be_true
+          match_data_has_key?(match_data.values, :"expected first").should be_true
+          match_data_has_key?(match_data.values, :"expected last").should be_true
+          match_data_has_key?(match_data.values, :"expected size").should be_true
         end
 
         it "contains a key for each actual value" do
@@ -260,9 +260,9 @@ describe Spectator::Matchers::AttributesMatcher do
           partial = new_partial(array)
           matcher = Spectator::Matchers::AttributesMatcher.new(attributes)
           match_data = matcher.match(partial)
-          match_data_has_key?(match_data, :"actual first").should be_true
-          match_data_has_key?(match_data, :"actual last").should be_true
-          match_data_has_key?(match_data, :"actual size").should be_true
+          match_data_has_key?(match_data.values, :"actual first").should be_true
+          match_data_has_key?(match_data.values, :"actual last").should be_true
+          match_data_has_key?(match_data.values, :"actual size").should be_true
         end
 
         it "has the expected values" do
@@ -271,9 +271,9 @@ describe Spectator::Matchers::AttributesMatcher do
           partial = new_partial(array)
           matcher = Spectator::Matchers::AttributesMatcher.new(attributes)
           match_data = matcher.match(partial)
-          match_data_value_sans_prefix(match_data, :"expected first")[:value].should eq(attributes[:first])
-          match_data_value_sans_prefix(match_data, :"expected last")[:value].should eq(attributes[:last])
-          match_data_value_sans_prefix(match_data, :"expected size")[:value].should eq(attributes[:size])
+          match_data_value_sans_prefix(match_data.values, :"expected first")[:value].should eq(attributes[:first])
+          match_data_value_sans_prefix(match_data.values, :"expected last")[:value].should eq(attributes[:last])
+          match_data_value_sans_prefix(match_data.values, :"expected size")[:value].should eq(attributes[:size])
         end
 
         it "has the actual values" do
@@ -282,9 +282,9 @@ describe Spectator::Matchers::AttributesMatcher do
           partial = new_partial(array)
           matcher = Spectator::Matchers::AttributesMatcher.new(attributes)
           match_data = matcher.match(partial)
-          match_data_value_sans_prefix(match_data, :"actual first")[:value].should eq(array.first)
-          match_data_value_sans_prefix(match_data, :"actual last")[:value].should eq(array.last)
-          match_data_value_sans_prefix(match_data, :"actual size")[:value].should eq(array.size)
+          match_data_value_sans_prefix(match_data.values, :"actual first")[:value].should eq(array.first)
+          match_data_value_sans_prefix(match_data.values, :"actual last")[:value].should eq(array.last)
+          match_data_value_sans_prefix(match_data.values, :"actual size")[:value].should eq(array.size)
         end
       end
 
diff --git a/spec/matchers/case_matcher_spec.cr b/spec/matchers/case_matcher_spec.cr
index 19c8f11..cf4d442 100644
--- a/spec/matchers/case_matcher_spec.cr
+++ b/spec/matchers/case_matcher_spec.cr
@@ -99,7 +99,7 @@ describe Spectator::Matchers::CaseMatcher do
             partial = new_partial(actual)
             matcher = Spectator::Matchers::CaseMatcher.new(expected)
             match_data = matcher.match(partial)
-            match_data_value_sans_prefix(match_data, :expected)[:value].should eq(expected)
+            match_data_value_sans_prefix(match_data.values, :expected)[:value].should eq(expected)
           end
         end
 
@@ -110,7 +110,7 @@ describe Spectator::Matchers::CaseMatcher do
             partial = new_partial(actual)
             matcher = Spectator::Matchers::CaseMatcher.new(expected)
             match_data = matcher.match(partial)
-            match_data_value_sans_prefix(match_data, :actual)[:value].should eq(actual)
+            match_data_value_sans_prefix(match_data.values, :actual)[:value].should eq(actual)
           end
         end
       end
diff --git a/spec/matchers/contain_matcher_spec.cr b/spec/matchers/contain_matcher_spec.cr
index f06a79a..a10af48 100644
--- a/spec/matchers/contain_matcher_spec.cr
+++ b/spec/matchers/contain_matcher_spec.cr
@@ -300,7 +300,7 @@ describe Spectator::Matchers::ContainMatcher do
             partial = new_partial(array)
             matcher = Spectator::Matchers::ContainMatcher.new(search)
             match_data = matcher.match(partial)
-            match_data_value_sans_prefix(match_data, :subset)[:value].should eq(search)
+            match_data_value_sans_prefix(match_data.values, :subset)[:value].should eq(search)
           end
         end
 
@@ -311,7 +311,7 @@ describe Spectator::Matchers::ContainMatcher do
             partial = new_partial(array)
             matcher = Spectator::Matchers::ContainMatcher.new(search)
             match_data = matcher.match(partial)
-            match_data_value_sans_prefix(match_data, :superset)[:value].should eq(array)
+            match_data_value_sans_prefix(match_data.values, :superset)[:value].should eq(array)
           end
         end
       end
diff --git a/spec/matchers/empty_matcher_spec.cr b/spec/matchers/empty_matcher_spec.cr
index 78984d9..eea43bc 100644
--- a/spec/matchers/empty_matcher_spec.cr
+++ b/spec/matchers/empty_matcher_spec.cr
@@ -32,7 +32,7 @@ describe Spectator::Matchers::EmptyMatcher do
             partial = new_partial(array)
             matcher = Spectator::Matchers::EmptyMatcher.new
             match_data = matcher.match(partial)
-            match_data_value_sans_prefix(match_data, :expected)[:to_s].should eq("[]")
+            match_data_value_sans_prefix(match_data.values, :expected)[:to_s].should eq("[]")
           end
         end
 
@@ -42,7 +42,7 @@ describe Spectator::Matchers::EmptyMatcher do
             partial = new_partial(array)
             matcher = Spectator::Matchers::EmptyMatcher.new
             match_data = matcher.match(partial)
-            match_data_value_sans_prefix(match_data, :actual)[:value].should eq(array)
+            match_data_value_sans_prefix(match_data.values, :actual)[:value].should eq(array)
           end
         end
       end
diff --git a/spec/matchers/end_with_matcher_spec.cr b/spec/matchers/end_with_matcher_spec.cr
index fcc821c..d9894d5 100644
--- a/spec/matchers/end_with_matcher_spec.cr
+++ b/spec/matchers/end_with_matcher_spec.cr
@@ -213,7 +213,7 @@ describe Spectator::Matchers::EndWithMatcher do
               partial = new_partial(value)
               matcher = Spectator::Matchers::EndWithMatcher.new(last)
               match_data = matcher.match(partial)
-              match_data_value_sans_prefix(match_data, :expected)[:value].should eq(last)
+              match_data_value_sans_prefix(match_data.values, :expected)[:value].should eq(last)
             end
           end
 
@@ -224,7 +224,7 @@ describe Spectator::Matchers::EndWithMatcher do
               partial = new_partial(value)
               matcher = Spectator::Matchers::EndWithMatcher.new(last)
               match_data = matcher.match(partial)
-              match_data_value_sans_prefix(match_data, :actual)[:value].should eq(value)
+              match_data_value_sans_prefix(match_data.values, :actual)[:value].should eq(value)
             end
           end
         end
@@ -237,7 +237,7 @@ describe Spectator::Matchers::EndWithMatcher do
               partial = new_partial(array)
               matcher = Spectator::Matchers::EndWithMatcher.new(last)
               match_data = matcher.match(partial)
-              match_data_value_sans_prefix(match_data, :expected)[:value].should eq(last)
+              match_data_value_sans_prefix(match_data.values, :expected)[:value].should eq(last)
             end
           end
 
@@ -248,7 +248,7 @@ describe Spectator::Matchers::EndWithMatcher do
               partial = new_partial(array)
               matcher = Spectator::Matchers::EndWithMatcher.new(last)
               match_data = matcher.match(partial)
-              match_data_value_sans_prefix(match_data, :actual)[:value].should eq(array.last)
+              match_data_value_sans_prefix(match_data.values, :actual)[:value].should eq(array.last)
             end
           end
 
@@ -259,7 +259,7 @@ describe Spectator::Matchers::EndWithMatcher do
               partial = new_partial(array)
               matcher = Spectator::Matchers::EndWithMatcher.new(last)
               match_data = matcher.match(partial)
-              match_data_value_sans_prefix(match_data, :list)[:value].should eq(array)
+              match_data_value_sans_prefix(match_data.values, :list)[:value].should eq(array)
             end
           end
         end
diff --git a/spec/matchers/equality_matcher_spec.cr b/spec/matchers/equality_matcher_spec.cr
index 8b2b8c8..b997a0f 100644
--- a/spec/matchers/equality_matcher_spec.cr
+++ b/spec/matchers/equality_matcher_spec.cr
@@ -76,7 +76,7 @@ describe Spectator::Matchers::EqualityMatcher do
             partial = new_partial(actual)
             matcher = Spectator::Matchers::EqualityMatcher.new(expected)
             match_data = matcher.match(partial)
-            match_data_value_sans_prefix(match_data, :expected)[:value].should eq(expected)
+            match_data_value_sans_prefix(match_data.values, :expected)[:value].should eq(expected)
           end
         end
 
@@ -86,7 +86,7 @@ describe Spectator::Matchers::EqualityMatcher do
             partial = new_partial(actual)
             matcher = Spectator::Matchers::EqualityMatcher.new(expected)
             match_data = matcher.match(partial)
-            match_data_value_sans_prefix(match_data, :actual)[:value].should eq(actual)
+            match_data_value_sans_prefix(match_data.values, :actual)[:value].should eq(actual)
           end
         end
       end
diff --git a/spec/matchers/exception_matcher_spec.cr b/spec/matchers/exception_matcher_spec.cr
index 9204d2c..b5c31b4 100644
--- a/spec/matchers/exception_matcher_spec.cr
+++ b/spec/matchers/exception_matcher_spec.cr
@@ -94,7 +94,7 @@ describe Spectator::Matchers::ExceptionMatcher do
             partial = new_block_partial { raise ArgumentError.new }
             matcher = Spectator::Matchers::ExceptionMatcher(KeyError, Nil).new
             match_data = matcher.match(partial)
-            match_data_value_sans_prefix(match_data, :"expected type")[:value].should eq(KeyError)
+            match_data_value_sans_prefix(match_data.values, :"expected type")[:value].should eq(KeyError)
           end
         end
 
@@ -103,7 +103,7 @@ describe Spectator::Matchers::ExceptionMatcher do
             partial = new_block_partial { raise ArgumentError.new }
             matcher = Spectator::Matchers::ExceptionMatcher(KeyError, Nil).new
             match_data = matcher.match(partial)
-            match_data_value_sans_prefix(match_data, :"actual type")[:value].should eq(ArgumentError)
+            match_data_value_sans_prefix(match_data.values, :"actual type")[:value].should eq(ArgumentError)
           end
 
           context "when nothing is raised" do
@@ -111,7 +111,7 @@ describe Spectator::Matchers::ExceptionMatcher do
               partial = new_block_partial { 42 }
               matcher = Spectator::Matchers::ExceptionMatcher(KeyError, Nil).new
               match_data = matcher.match(partial)
-              match_data_value_sans_prefix(match_data, :"actual type")[:value].should eq(Nil)
+              match_data_value_sans_prefix(match_data.values, :"actual type")[:value].should eq(Nil)
             end
           end
         end
@@ -122,7 +122,7 @@ describe Spectator::Matchers::ExceptionMatcher do
             partial = new_block_partial { raise ArgumentError.new("foobar") }
             matcher = Spectator::Matchers::ExceptionMatcher(KeyError, Regex).new(regex, "label")
             match_data = matcher.match(partial)
-            match_data_value_sans_prefix(match_data, :"expected message")[:value].should eq(regex)
+            match_data_value_sans_prefix(match_data.values, :"expected message")[:value].should eq(regex)
           end
         end
 
@@ -132,7 +132,7 @@ describe Spectator::Matchers::ExceptionMatcher do
             partial = new_block_partial { raise ArgumentError.new(message) }
             matcher = Spectator::Matchers::ExceptionMatcher(KeyError, Regex).new(/baz/, "label")
             match_data = matcher.match(partial)
-            match_data_value_sans_prefix(match_data, :"actual message")[:value].should eq(message)
+            match_data_value_sans_prefix(match_data.values, :"actual message")[:value].should eq(message)
           end
         end
       end
diff --git a/spec/matchers/greater_than_equal_matcher_spec.cr b/spec/matchers/greater_than_equal_matcher_spec.cr
index df14fb6..cc1c6a3 100644
--- a/spec/matchers/greater_than_equal_matcher_spec.cr
+++ b/spec/matchers/greater_than_equal_matcher_spec.cr
@@ -53,7 +53,7 @@ describe Spectator::Matchers::GreaterThanEqualMatcher do
             partial = new_partial(actual)
             matcher = Spectator::Matchers::GreaterThanEqualMatcher.new(expected)
             match_data = matcher.match(partial)
-            match_data_value_sans_prefix(match_data, :expected)[:value].should eq(expected)
+            match_data_value_sans_prefix(match_data.values, :expected)[:value].should eq(expected)
           end
 
           it "is prefixed with >=" do
@@ -62,7 +62,7 @@ describe Spectator::Matchers::GreaterThanEqualMatcher do
             partial = new_partial(actual)
             matcher = Spectator::Matchers::GreaterThanEqualMatcher.new(expected)
             match_data = matcher.match(partial)
-            match_data_value_sans_prefix(match_data, :expected)[:to_s].should start_with(">=")
+            match_data_value_sans_prefix(match_data.values, :expected)[:to_s].should start_with(">=")
           end
         end
 
@@ -73,7 +73,7 @@ describe Spectator::Matchers::GreaterThanEqualMatcher do
             partial = new_partial(actual)
             matcher = Spectator::Matchers::GreaterThanEqualMatcher.new(expected)
             match_data = matcher.match(partial)
-            match_data_value_sans_prefix(match_data, :actual)[:value].should eq(actual)
+            match_data_value_sans_prefix(match_data.values, :actual)[:value].should eq(actual)
           end
 
           context "when #matched? is true" do
@@ -84,7 +84,7 @@ describe Spectator::Matchers::GreaterThanEqualMatcher do
               matcher = Spectator::Matchers::GreaterThanEqualMatcher.new(expected)
               match_data = matcher.match(partial)
               match_data.matched?.should be_true # Sanity check.
-              match_data_value_sans_prefix(match_data, :actual)[:to_s].should start_with(">=")
+              match_data_value_sans_prefix(match_data.values, :actual)[:to_s].should start_with(">=")
             end
           end
 
@@ -96,7 +96,7 @@ describe Spectator::Matchers::GreaterThanEqualMatcher do
               matcher = Spectator::Matchers::GreaterThanEqualMatcher.new(expected)
               match_data = matcher.match(partial)
               match_data.matched?.should be_false # Sanity check.
-              match_data_value_sans_prefix(match_data, :actual)[:to_s].should start_with("<")
+              match_data_value_sans_prefix(match_data.values, :actual)[:to_s].should start_with("<")
             end
           end
         end
diff --git a/spec/matchers/greater_than_matcher_spec.cr b/spec/matchers/greater_than_matcher_spec.cr
index 9b15d74..bcd2a57 100644
--- a/spec/matchers/greater_than_matcher_spec.cr
+++ b/spec/matchers/greater_than_matcher_spec.cr
@@ -53,7 +53,7 @@ describe Spectator::Matchers::GreaterThanMatcher do
             partial = new_partial(actual)
             matcher = Spectator::Matchers::GreaterThanMatcher.new(expected)
             match_data = matcher.match(partial)
-            match_data_value_sans_prefix(match_data, :expected)[:value].should eq(expected)
+            match_data_value_sans_prefix(match_data.values, :expected)[:value].should eq(expected)
           end
 
           it "is prefixed with >" do
@@ -62,7 +62,7 @@ describe Spectator::Matchers::GreaterThanMatcher do
             partial = new_partial(actual)
             matcher = Spectator::Matchers::GreaterThanMatcher.new(expected)
             match_data = matcher.match(partial)
-            match_data_value_sans_prefix(match_data, :expected)[:to_s].should start_with(">")
+            match_data_value_sans_prefix(match_data.values, :expected)[:to_s].should start_with(">")
           end
         end
 
@@ -73,7 +73,7 @@ describe Spectator::Matchers::GreaterThanMatcher do
             partial = new_partial(actual)
             matcher = Spectator::Matchers::GreaterThanMatcher.new(expected)
             match_data = matcher.match(partial)
-            match_data_value_sans_prefix(match_data, :actual)[:value].should eq(actual)
+            match_data_value_sans_prefix(match_data.values, :actual)[:value].should eq(actual)
           end
 
           context "when #matched? is true" do
@@ -84,7 +84,7 @@ describe Spectator::Matchers::GreaterThanMatcher do
               matcher = Spectator::Matchers::GreaterThanMatcher.new(expected)
               match_data = matcher.match(partial)
               match_data.matched?.should be_true # Sanity check.
-              match_data_value_sans_prefix(match_data, :actual)[:to_s].should start_with(">")
+              match_data_value_sans_prefix(match_data.values, :actual)[:to_s].should start_with(">")
             end
           end
 
@@ -96,7 +96,7 @@ describe Spectator::Matchers::GreaterThanMatcher do
               matcher = Spectator::Matchers::GreaterThanMatcher.new(expected)
               match_data = matcher.match(partial)
               match_data.matched?.should be_false # Sanity check.
-              match_data_value_sans_prefix(match_data, :actual)[:to_s].should start_with("<=")
+              match_data_value_sans_prefix(match_data.values, :actual)[:to_s].should start_with("<=")
             end
           end
         end
diff --git a/spec/matchers/have_key_matcher_spec.cr b/spec/matchers/have_key_matcher_spec.cr
index 8bd8a19..cbcf6f6 100644
--- a/spec/matchers/have_key_matcher_spec.cr
+++ b/spec/matchers/have_key_matcher_spec.cr
@@ -67,7 +67,7 @@ describe Spectator::Matchers::HaveKeyMatcher do
             partial = new_partial(tuple)
             matcher = Spectator::Matchers::HaveKeyMatcher.new(key)
             match_data = matcher.match(partial)
-            match_data_value_sans_prefix(match_data, :key)[:value].should eq(key)
+            match_data_value_sans_prefix(match_data.values, :key)[:value].should eq(key)
           end
         end
 
@@ -79,7 +79,7 @@ describe Spectator::Matchers::HaveKeyMatcher do
               partial = new_partial(tuple)
               matcher = Spectator::Matchers::HaveKeyMatcher.new(key)
               match_data = matcher.match(partial)
-              match_data_value_sans_prefix(match_data, :actual)[:value].should eq(tuple.keys)
+              match_data_value_sans_prefix(match_data.values, :actual)[:value].should eq(tuple.keys)
             end
           end
 
@@ -90,7 +90,7 @@ describe Spectator::Matchers::HaveKeyMatcher do
               partial = new_partial(actual)
               matcher = Spectator::Matchers::HaveKeyMatcher.new(key)
               match_data = matcher.match(partial)
-              match_data_value_sans_prefix(match_data, :actual)[:value].should eq(actual)
+              match_data_value_sans_prefix(match_data.values, :actual)[:value].should eq(actual)
             end
           end
         end
diff --git a/spec/matchers/have_matcher_spec.cr b/spec/matchers/have_matcher_spec.cr
index c65d4f4..f4e917f 100644
--- a/spec/matchers/have_matcher_spec.cr
+++ b/spec/matchers/have_matcher_spec.cr
@@ -518,7 +518,7 @@ describe Spectator::Matchers::HaveMatcher do
             partial = new_partial(array)
             matcher = Spectator::Matchers::HaveMatcher.new(search)
             match_data = matcher.match(partial)
-            match_data_value_sans_prefix(match_data, :subset)[:value].should eq(search)
+            match_data_value_sans_prefix(match_data.values, :subset)[:value].should eq(search)
           end
         end
 
@@ -529,7 +529,7 @@ describe Spectator::Matchers::HaveMatcher do
             partial = new_partial(array)
             matcher = Spectator::Matchers::HaveMatcher.new(search)
             match_data = matcher.match(partial)
-            match_data_value_sans_prefix(match_data, :superset)[:value].should eq(array)
+            match_data_value_sans_prefix(match_data.values, :superset)[:value].should eq(array)
           end
         end
       end
diff --git a/spec/matchers/have_value_matcher_spec.cr b/spec/matchers/have_value_matcher_spec.cr
index 5a37e5a..78ba281 100644
--- a/spec/matchers/have_value_matcher_spec.cr
+++ b/spec/matchers/have_value_matcher_spec.cr
@@ -41,7 +41,7 @@ describe Spectator::Matchers::HaveValueMatcher do
             partial = new_partial(hash)
             matcher = Spectator::Matchers::HaveValueMatcher.new(value)
             match_data = matcher.match(partial)
-            match_data_value_sans_prefix(match_data, :value)[:value].should eq(value)
+            match_data_value_sans_prefix(match_data.values, :value)[:value].should eq(value)
           end
         end
 
@@ -53,7 +53,7 @@ describe Spectator::Matchers::HaveValueMatcher do
               partial = new_partial(hash)
               matcher = Spectator::Matchers::HaveValueMatcher.new(value)
               match_data = matcher.match(partial)
-              match_data_value_sans_prefix(match_data, :actual)[:value].should eq(hash.values)
+              match_data_value_sans_prefix(match_data.values, :actual)[:value].should eq(hash.values)
             end
           end
 
@@ -64,7 +64,7 @@ describe Spectator::Matchers::HaveValueMatcher do
               partial = new_partial(actual)
               matcher = Spectator::Matchers::HaveValueMatcher.new(value)
               match_data = matcher.match(partial)
-              match_data_value_sans_prefix(match_data, :actual)[:value].should eq(actual)
+              match_data_value_sans_prefix(match_data.values, :actual)[:value].should eq(actual)
             end
           end
         end
diff --git a/spec/matchers/inequality_matcher_spec.cr b/spec/matchers/inequality_matcher_spec.cr
index fdabfe1..1dcdcfc 100644
--- a/spec/matchers/inequality_matcher_spec.cr
+++ b/spec/matchers/inequality_matcher_spec.cr
@@ -76,7 +76,7 @@ describe Spectator::Matchers::InequalityMatcher do
             partial = new_partial(actual)
             matcher = Spectator::Matchers::InequalityMatcher.new(expected)
             match_data = matcher.match(partial)
-            match_data_value_sans_prefix(match_data, :expected)[:value].should eq(expected)
+            match_data_value_sans_prefix(match_data.values, :expected)[:value].should eq(expected)
           end
 
           it "is prefixed with 'Not'" do
@@ -84,7 +84,7 @@ describe Spectator::Matchers::InequalityMatcher do
             partial = new_partial(actual)
             matcher = Spectator::Matchers::InequalityMatcher.new(expected)
             match_data = matcher.match(partial)
-            match_data_value_sans_prefix(match_data, :expected)[:to_s].should start_with("Not")
+            match_data_value_sans_prefix(match_data.values, :expected)[:to_s].should start_with("Not")
           end
         end
 
@@ -94,7 +94,7 @@ describe Spectator::Matchers::InequalityMatcher do
             partial = new_partial(actual)
             matcher = Spectator::Matchers::InequalityMatcher.new(expected)
             match_data = matcher.match(partial)
-            match_data_value_sans_prefix(match_data, :actual)[:value].should eq(actual)
+            match_data_value_sans_prefix(match_data.values, :actual)[:value].should eq(actual)
           end
         end
       end
diff --git a/spec/matchers/less_than_equal_matcher_spec.cr b/spec/matchers/less_than_equal_matcher_spec.cr
index 2cddf84..d6fd825 100644
--- a/spec/matchers/less_than_equal_matcher_spec.cr
+++ b/spec/matchers/less_than_equal_matcher_spec.cr
@@ -53,7 +53,7 @@ describe Spectator::Matchers::LessThanEqualMatcher do
             partial = new_partial(actual)
             matcher = Spectator::Matchers::LessThanEqualMatcher.new(expected)
             match_data = matcher.match(partial)
-            match_data_value_sans_prefix(match_data, :expected)[:value].should eq(expected)
+            match_data_value_sans_prefix(match_data.values, :expected)[:value].should eq(expected)
           end
 
           it "is prefixed with <=" do
@@ -62,7 +62,7 @@ describe Spectator::Matchers::LessThanEqualMatcher do
             partial = new_partial(actual)
             matcher = Spectator::Matchers::LessThanEqualMatcher.new(expected)
             match_data = matcher.match(partial)
-            match_data_value_sans_prefix(match_data, :expected)[:to_s].should start_with("<=")
+            match_data_value_sans_prefix(match_data.values, :expected)[:to_s].should start_with("<=")
           end
         end
 
@@ -73,7 +73,7 @@ describe Spectator::Matchers::LessThanEqualMatcher do
             partial = new_partial(actual)
             matcher = Spectator::Matchers::LessThanEqualMatcher.new(expected)
             match_data = matcher.match(partial)
-            match_data_value_sans_prefix(match_data, :actual)[:value].should eq(actual)
+            match_data_value_sans_prefix(match_data.values, :actual)[:value].should eq(actual)
           end
 
           context "when #matched? is true" do
@@ -84,7 +84,7 @@ describe Spectator::Matchers::LessThanEqualMatcher do
               matcher = Spectator::Matchers::LessThanEqualMatcher.new(expected)
               match_data = matcher.match(partial)
               match_data.matched?.should be_true # Sanity check.
-              match_data_value_sans_prefix(match_data, :actual)[:to_s].should start_with("<=")
+              match_data_value_sans_prefix(match_data.values, :actual)[:to_s].should start_with("<=")
             end
           end
 
@@ -96,7 +96,7 @@ describe Spectator::Matchers::LessThanEqualMatcher do
               matcher = Spectator::Matchers::LessThanEqualMatcher.new(expected)
               match_data = matcher.match(partial)
               match_data.matched?.should be_false # Sanity check.
-              match_data_value_sans_prefix(match_data, :actual)[:to_s].should start_with(">")
+              match_data_value_sans_prefix(match_data.values, :actual)[:to_s].should start_with(">")
             end
           end
         end
diff --git a/spec/matchers/less_than_matcher_spec.cr b/spec/matchers/less_than_matcher_spec.cr
index a809632..695d55a 100644
--- a/spec/matchers/less_than_matcher_spec.cr
+++ b/spec/matchers/less_than_matcher_spec.cr
@@ -53,7 +53,7 @@ describe Spectator::Matchers::LessThanMatcher do
             partial = new_partial(actual)
             matcher = Spectator::Matchers::LessThanMatcher.new(expected)
             match_data = matcher.match(partial)
-            match_data_value_sans_prefix(match_data, :expected)[:value].should eq(expected)
+            match_data_value_sans_prefix(match_data.values, :expected)[:value].should eq(expected)
           end
 
           it "is prefixed with <" do
@@ -62,7 +62,7 @@ describe Spectator::Matchers::LessThanMatcher do
             partial = new_partial(actual)
             matcher = Spectator::Matchers::LessThanMatcher.new(expected)
             match_data = matcher.match(partial)
-            match_data_value_sans_prefix(match_data, :expected)[:to_s].should start_with("<")
+            match_data_value_sans_prefix(match_data.values, :expected)[:to_s].should start_with("<")
           end
         end
 
@@ -73,7 +73,7 @@ describe Spectator::Matchers::LessThanMatcher do
             partial = new_partial(actual)
             matcher = Spectator::Matchers::LessThanMatcher.new(expected)
             match_data = matcher.match(partial)
-            match_data_value_sans_prefix(match_data, :actual)[:value].should eq(actual)
+            match_data_value_sans_prefix(match_data.values, :actual)[:value].should eq(actual)
           end
 
           context "when #matched? is true" do
@@ -84,7 +84,7 @@ describe Spectator::Matchers::LessThanMatcher do
               matcher = Spectator::Matchers::LessThanMatcher.new(expected)
               match_data = matcher.match(partial)
               match_data.matched?.should be_true # Sanity check.
-              match_data_value_sans_prefix(match_data, :actual)[:to_s].should start_with("<")
+              match_data_value_sans_prefix(match_data.values, :actual)[:to_s].should start_with("<")
             end
           end
 
@@ -96,7 +96,7 @@ describe Spectator::Matchers::LessThanMatcher do
               matcher = Spectator::Matchers::LessThanMatcher.new(expected)
               match_data = matcher.match(partial)
               match_data.matched?.should be_false # Sanity check.
-              match_data_value_sans_prefix(match_data, :actual)[:to_s].should start_with(">=")
+              match_data_value_sans_prefix(match_data.values, :actual)[:to_s].should start_with(">=")
             end
           end
         end
diff --git a/spec/matchers/nil_matcher_spec.cr b/spec/matchers/nil_matcher_spec.cr
index 4455058..3250d02 100644
--- a/spec/matchers/nil_matcher_spec.cr
+++ b/spec/matchers/nil_matcher_spec.cr
@@ -31,7 +31,7 @@ describe Spectator::Matchers::NilMatcher do
             partial = new_partial(42)
             matcher = Spectator::Matchers::NilMatcher.new
             match_data = matcher.match(partial)
-            match_data_value_sans_prefix(match_data, :expected)[:value].should eq(nil)
+            match_data_value_sans_prefix(match_data.values, :expected)[:value].should eq(nil)
           end
         end
 
@@ -41,7 +41,7 @@ describe Spectator::Matchers::NilMatcher do
             partial = new_partial(value)
             matcher = Spectator::Matchers::NilMatcher.new
             match_data = matcher.match(partial)
-            match_data_value_sans_prefix(match_data, :actual)[:value].should eq(value)
+            match_data_value_sans_prefix(match_data.values, :actual)[:value].should eq(value)
           end
         end
       end
diff --git a/spec/matchers/predicate_matcher_spec.cr b/spec/matchers/predicate_matcher_spec.cr
index 083edc8..5a9b2c2 100644
--- a/spec/matchers/predicate_matcher_spec.cr
+++ b/spec/matchers/predicate_matcher_spec.cr
@@ -31,8 +31,8 @@ describe Spectator::Matchers::PredicateMatcher do
           partial = new_partial(value)
           matcher = Spectator::Matchers::PredicateMatcher(NamedTuple(empty: Nil, ascii_only: Nil)).new
           match_data = matcher.match(partial)
-          match_data_has_key?(match_data, :empty).should be_true
-          match_data_has_key?(match_data, :ascii_only).should be_true
+          match_data_has_key?(match_data.values, :empty).should be_true
+          match_data_has_key?(match_data.values, :ascii_only).should be_true
         end
 
         it "has the actual values" do
@@ -40,8 +40,8 @@ describe Spectator::Matchers::PredicateMatcher do
           partial = new_partial(value)
           matcher = Spectator::Matchers::PredicateMatcher(NamedTuple(empty: Nil, ascii_only: Nil)).new
           match_data = matcher.match(partial)
-          match_data_value_sans_prefix(match_data, :empty)[:value].should eq(value.empty?)
-          match_data_value_sans_prefix(match_data, :ascii_only)[:value].should eq(value.ascii_only?)
+          match_data_value_sans_prefix(match_data.values, :empty)[:value].should eq(value.empty?)
+          match_data_value_sans_prefix(match_data.values, :ascii_only)[:value].should eq(value.ascii_only?)
         end
       end
 
diff --git a/spec/matchers/range_matcher_spec.cr b/spec/matchers/range_matcher_spec.cr
index 8d9c50e..71ffa15 100644
--- a/spec/matchers/range_matcher_spec.cr
+++ b/spec/matchers/range_matcher_spec.cr
@@ -157,7 +157,7 @@ describe Spectator::Matchers::RangeMatcher do
               partial = new_partial(5)
               matcher = Spectator::Matchers::RangeMatcher.new(range)
               match_data = matcher.match(partial)
-              match_data_value_sans_prefix(match_data, :lower)[:value].should eq(range.begin)
+              match_data_value_sans_prefix(match_data.values, :lower)[:value].should eq(range.begin)
             end
 
             it "is prefixed with >=" do
@@ -165,7 +165,7 @@ describe Spectator::Matchers::RangeMatcher do
               partial = new_partial(5)
               matcher = Spectator::Matchers::RangeMatcher.new(range)
               match_data = matcher.match(partial)
-              match_data_value_sans_prefix(match_data, :lower)[:to_s].should start_with(">=")
+              match_data_value_sans_prefix(match_data.values, :lower)[:to_s].should start_with(">=")
             end
           end
 
@@ -175,7 +175,7 @@ describe Spectator::Matchers::RangeMatcher do
               partial = new_partial(5)
               matcher = Spectator::Matchers::RangeMatcher.new(range)
               match_data = matcher.match(partial)
-              match_data_value_sans_prefix(match_data, :upper)[:value].should eq(range.end)
+              match_data_value_sans_prefix(match_data.values, :upper)[:value].should eq(range.end)
             end
 
             context "when inclusive" do
@@ -184,7 +184,7 @@ describe Spectator::Matchers::RangeMatcher do
                 partial = new_partial(5)
                 matcher = Spectator::Matchers::RangeMatcher.new(range)
                 match_data = matcher.match(partial)
-                match_data_value_sans_prefix(match_data, :upper)[:to_s].should start_with("<=")
+                match_data_value_sans_prefix(match_data.values, :upper)[:to_s].should start_with("<=")
               end
             end
 
@@ -194,7 +194,7 @@ describe Spectator::Matchers::RangeMatcher do
                 partial = new_partial(5)
                 matcher = Spectator::Matchers::RangeMatcher.new(range)
                 match_data = matcher.match(partial)
-                match_data_value_sans_prefix(match_data, :upper)[:to_s].should start_with("<")
+                match_data_value_sans_prefix(match_data.values, :upper)[:to_s].should start_with("<")
               end
             end
           end
@@ -206,7 +206,7 @@ describe Spectator::Matchers::RangeMatcher do
               partial = new_partial(value)
               matcher = Spectator::Matchers::RangeMatcher.new(range)
               match_data = matcher.match(partial)
-              match_data_value_sans_prefix(match_data, :actual)[:value].should eq(value)
+              match_data_value_sans_prefix(match_data.values, :actual)[:value].should eq(value)
             end
           end
         end
@@ -219,7 +219,7 @@ describe Spectator::Matchers::RangeMatcher do
               partial = new_partial(value)
               matcher = Spectator::Matchers::RangeMatcher.new(array)
               match_data = matcher.match(partial)
-              match_data_value_sans_prefix(match_data, :set)[:value].should eq(array)
+              match_data_value_sans_prefix(match_data.values, :set)[:value].should eq(array)
             end
           end
 
@@ -230,7 +230,7 @@ describe Spectator::Matchers::RangeMatcher do
               partial = new_partial(value)
               matcher = Spectator::Matchers::RangeMatcher.new(array)
               match_data = matcher.match(partial)
-              match_data_value_sans_prefix(match_data, :actual)[:value].should eq(value)
+              match_data_value_sans_prefix(match_data.values, :actual)[:value].should eq(value)
             end
           end
         end
diff --git a/spec/matchers/regex_matcher_spec.cr b/spec/matchers/regex_matcher_spec.cr
index f8a9ef4..295b9a7 100644
--- a/spec/matchers/regex_matcher_spec.cr
+++ b/spec/matchers/regex_matcher_spec.cr
@@ -43,7 +43,7 @@ describe Spectator::Matchers::RegexMatcher do
             partial = new_partial(value)
             matcher = Spectator::Matchers::RegexMatcher.new(pattern)
             match_data = matcher.match(partial)
-            match_data_value_sans_prefix(match_data, :expected)[:value].should eq(pattern)
+            match_data_value_sans_prefix(match_data.values, :expected)[:value].should eq(pattern)
           end
         end
 
@@ -54,7 +54,7 @@ describe Spectator::Matchers::RegexMatcher do
             partial = new_partial(value)
             matcher = Spectator::Matchers::RegexMatcher.new(pattern)
             match_data = matcher.match(partial)
-            match_data_value_sans_prefix(match_data, :actual)[:value].should eq(value)
+            match_data_value_sans_prefix(match_data.values, :actual)[:value].should eq(value)
           end
         end
       end
diff --git a/spec/matchers/start_with_matcher_spec.cr b/spec/matchers/start_with_matcher_spec.cr
index d35f491..de626a5 100644
--- a/spec/matchers/start_with_matcher_spec.cr
+++ b/spec/matchers/start_with_matcher_spec.cr
@@ -213,7 +213,7 @@ describe Spectator::Matchers::StartWithMatcher do
               partial = new_partial(value)
               matcher = Spectator::Matchers::StartWithMatcher.new(first)
               match_data = matcher.match(partial)
-              match_data_value_sans_prefix(match_data, :expected)[:value].should eq(first)
+              match_data_value_sans_prefix(match_data.values, :expected)[:value].should eq(first)
             end
           end
 
@@ -224,7 +224,7 @@ describe Spectator::Matchers::StartWithMatcher do
               partial = new_partial(value)
               matcher = Spectator::Matchers::StartWithMatcher.new(first)
               match_data = matcher.match(partial)
-              match_data_value_sans_prefix(match_data, :actual)[:value].should eq(value)
+              match_data_value_sans_prefix(match_data.values, :actual)[:value].should eq(value)
             end
           end
         end
@@ -237,7 +237,7 @@ describe Spectator::Matchers::StartWithMatcher do
               partial = new_partial(array)
               matcher = Spectator::Matchers::StartWithMatcher.new(first)
               match_data = matcher.match(partial)
-              match_data_value_sans_prefix(match_data, :expected)[:value].should eq(first)
+              match_data_value_sans_prefix(match_data.values, :expected)[:value].should eq(first)
             end
           end
 
@@ -248,7 +248,7 @@ describe Spectator::Matchers::StartWithMatcher do
               partial = new_partial(array)
               matcher = Spectator::Matchers::StartWithMatcher.new(first)
               match_data = matcher.match(partial)
-              match_data_value_sans_prefix(match_data, :actual)[:value].should eq(array.first)
+              match_data_value_sans_prefix(match_data.values, :actual)[:value].should eq(array.first)
             end
           end
 
@@ -259,7 +259,7 @@ describe Spectator::Matchers::StartWithMatcher do
               partial = new_partial(array)
               matcher = Spectator::Matchers::StartWithMatcher.new(first)
               match_data = matcher.match(partial)
-              match_data_value_sans_prefix(match_data, :list)[:value].should eq(array)
+              match_data_value_sans_prefix(match_data.values, :list)[:value].should eq(array)
             end
           end
         end
diff --git a/spec/matchers/truthy_matcher_spec.cr b/spec/matchers/truthy_matcher_spec.cr
index 21c0d24..91acae9 100644
--- a/spec/matchers/truthy_matcher_spec.cr
+++ b/spec/matchers/truthy_matcher_spec.cr
@@ -58,7 +58,7 @@ describe Spectator::Matchers::TruthyMatcher do
               partial = new_partial(value)
               matcher = Spectator::Matchers::TruthyMatcher.new(true)
               match_data = matcher.match(partial)
-              match_data_value_sans_prefix(match_data, :expected)[:to_s].should match(/false or nil/i)
+              match_data_value_sans_prefix(match_data.values, :expected)[:to_s].should match(/false or nil/i)
             end
 
             it "is prefixed with \"Not\"" do
@@ -66,7 +66,7 @@ describe Spectator::Matchers::TruthyMatcher do
               partial = new_partial(value)
               matcher = Spectator::Matchers::TruthyMatcher.new(true)
               match_data = matcher.match(partial)
-              match_data_value_sans_prefix(match_data, :expected)[:to_s].should start_with(/not/i)
+              match_data_value_sans_prefix(match_data.values, :expected)[:to_s].should start_with(/not/i)
             end
           end
 
@@ -76,7 +76,7 @@ describe Spectator::Matchers::TruthyMatcher do
               partial = new_partial(value)
               matcher = Spectator::Matchers::TruthyMatcher.new(true)
               match_data = matcher.match(partial)
-              match_data_value_sans_prefix(match_data, :actual)[:value].should eq(value)
+              match_data_value_sans_prefix(match_data.values, :actual)[:value].should eq(value)
             end
           end
 
@@ -87,7 +87,7 @@ describe Spectator::Matchers::TruthyMatcher do
                 partial = new_partial(value)
                 matcher = Spectator::Matchers::TruthyMatcher.new(true)
                 match_data = matcher.match(partial)
-                match_data_value_sans_prefix(match_data, :truthy)[:value].should be_true
+                match_data_value_sans_prefix(match_data.values, :truthy)[:value].should be_true
               end
             end
 
@@ -97,7 +97,7 @@ describe Spectator::Matchers::TruthyMatcher do
                 partial = new_partial(value)
                 matcher = Spectator::Matchers::TruthyMatcher.new(true)
                 match_data = matcher.match(partial)
-                match_data_value_sans_prefix(match_data, :truthy)[:value].should be_false
+                match_data_value_sans_prefix(match_data.values, :truthy)[:value].should be_false
               end
             end
 
@@ -107,7 +107,7 @@ describe Spectator::Matchers::TruthyMatcher do
                 partial = new_partial(value)
                 matcher = Spectator::Matchers::TruthyMatcher.new(true)
                 match_data = matcher.match(partial)
-                match_data_value_sans_prefix(match_data, :truthy)[:value].should be_false
+                match_data_value_sans_prefix(match_data.values, :truthy)[:value].should be_false
               end
             end
           end
@@ -194,7 +194,7 @@ describe Spectator::Matchers::TruthyMatcher do
               partial = new_partial(value)
               matcher = Spectator::Matchers::TruthyMatcher.new(false)
               match_data = matcher.match(partial)
-              match_data_value_sans_prefix(match_data, :expected)[:to_s].should match(/false or nil/i)
+              match_data_value_sans_prefix(match_data.values, :expected)[:to_s].should match(/false or nil/i)
             end
 
             it "is not prefixed with \"Not\"" do
@@ -202,7 +202,7 @@ describe Spectator::Matchers::TruthyMatcher do
               partial = new_partial(value)
               matcher = Spectator::Matchers::TruthyMatcher.new(false)
               match_data = matcher.match(partial)
-              match_data_value_sans_prefix(match_data, :expected)[:to_s].should_not start_with(/not/i)
+              match_data_value_sans_prefix(match_data.values, :expected)[:to_s].should_not start_with(/not/i)
             end
           end
 
@@ -212,7 +212,7 @@ describe Spectator::Matchers::TruthyMatcher do
               partial = new_partial(value)
               matcher = Spectator::Matchers::TruthyMatcher.new(false)
               match_data = matcher.match(partial)
-              match_data_value_sans_prefix(match_data, :actual)[:value].should eq(value)
+              match_data_value_sans_prefix(match_data.values, :actual)[:value].should eq(value)
             end
           end
 
@@ -223,7 +223,7 @@ describe Spectator::Matchers::TruthyMatcher do
                 partial = new_partial(value)
                 matcher = Spectator::Matchers::TruthyMatcher.new(false)
                 match_data = matcher.match(partial)
-                match_data_value_sans_prefix(match_data, :truthy)[:value].should be_true
+                match_data_value_sans_prefix(match_data.values, :truthy)[:value].should be_true
               end
             end
 
@@ -233,7 +233,7 @@ describe Spectator::Matchers::TruthyMatcher do
                 partial = new_partial(value)
                 matcher = Spectator::Matchers::TruthyMatcher.new(false)
                 match_data = matcher.match(partial)
-                match_data_value_sans_prefix(match_data, :truthy)[:value].should be_false
+                match_data_value_sans_prefix(match_data.values, :truthy)[:value].should be_false
               end
             end
 
@@ -243,7 +243,7 @@ describe Spectator::Matchers::TruthyMatcher do
                 partial = new_partial(value)
                 matcher = Spectator::Matchers::TruthyMatcher.new(false)
                 match_data = matcher.match(partial)
-                match_data_value_sans_prefix(match_data, :truthy)[:value].should be_false
+                match_data_value_sans_prefix(match_data.values, :truthy)[:value].should be_false
               end
             end
           end
diff --git a/spec/matchers/type_matcher_spec.cr b/spec/matchers/type_matcher_spec.cr
index e374563..81a430b 100644
--- a/spec/matchers/type_matcher_spec.cr
+++ b/spec/matchers/type_matcher_spec.cr
@@ -62,7 +62,7 @@ describe Spectator::Matchers::TypeMatcher do
             partial = new_partial(value)
             matcher = Spectator::Matchers::TypeMatcher(String).new
             match_data = matcher.match(partial)
-            match_data_value_sans_prefix(match_data, :expected)[:value].should eq(String)
+            match_data_value_sans_prefix(match_data.values, :expected)[:value].should eq(String)
           end
         end
 
@@ -72,7 +72,7 @@ describe Spectator::Matchers::TypeMatcher do
             partial = new_partial(value)
             matcher = Spectator::Matchers::TypeMatcher(String).new
             match_data = matcher.match(partial)
-            match_data_value_sans_prefix(match_data, :actual)[:value].should eq(typeof(value))
+            match_data_value_sans_prefix(match_data.values, :actual)[:value].should eq(typeof(value))
           end
         end
       end
diff --git a/src/spectator/matchers/generic_match_data_value.cr b/src/spectator/matchers/generic_match_data_value.cr
index 7e392ec..3d751f9 100644
--- a/src/spectator/matchers/generic_match_data_value.cr
+++ b/src/spectator/matchers/generic_match_data_value.cr
@@ -3,6 +3,9 @@ require "./match_data_value"
 module Spectator::Matchers
   # Wraps a value for used in match data.
   private class GenericMatchDataValue(T) < MatchDataValue
+    # Underlying value.
+    getter value
+
     # Creates the wrapper.
     def initialize(@value : T)
     end