Transform named tuple match data to array

Trying to keep some of the existing code (and better syntax).

src/spectator/matchers/match_data.cr

@@ -1,3 +1,7 @@
+require "./match_data_labeled_value"
+require "./match_data_value"
+require "./generic_match-data_value"
+
 module Spectator::Matchers
   # Information regarding a expectation parial and matcher.
   # `Matcher#match` will return a sub-type of this.
@@ -14,7 +18,22 @@ module Spectator::Matchers
     # Information about the match.
     # Returned elments will differ by matcher,
     # but all will return a set of labeled values.
-    abstract def values : Array(MatchDataLabeledValue)
+    def values : Array(MatchDataLabeledValue)
+      named_tuple.map do |key, value|
+        if value.is_a?(MatchDataValue)
+          MatchDataLabeledValue.new(key, value)
+        else
+          wrapper = GenericMatchDataValue.new(value)
+          MatchDataLabeledValue.new(key, wrapper)
+        end
+      end
+    end
+
+    # Raw information about the match.
+    # Sub-types must implement this and return a `NamedTuple`
+    # containing the match data values.
+    # This will be transformed and returned by `#values`.
+    private abstract def named_tuple
 
     # Describes the condition that satisfies the matcher.
     # This is informational and displayed to the end-user.