diff --git a/CHANGELOG.md b/CHANGELOG.md
index 4e23272..278c53c 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -4,6 +4,14 @@ All notable changes to this project will be documented in this file.
 The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/),
 and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0.html).
 
+## [0.12.0] - 2024-02-03
+### Added
+- Added ability to use matchers for case equality. [#55](https://github.com/icy-arctic-fox/spectator/issues/55)
+- Added support for nested case equality when checking arguments with Array, Tuple, Hash, and NamedTuple.
+
+### Fixed
+- Fixed some issues with the `be_within` matcher when used with expected and union types.
+
 ## [0.11.7] - 2023-10-16
 ### Fixed
 - Fix memoized value (`let`) with a union type causing segfault. [#81](https://gitlab.com/arctic-fox/spectator/-/issues/81)
@@ -450,7 +458,8 @@ This has been changed so that it compiles and raises an error at runtime with a
 First version ready for public use.
 
 
-[Unreleased]: https://gitlab.com/arctic-fox/spectator/-/compare/v0.11.7...master
+[Unreleased]: https://gitlab.com/arctic-fox/spectator/-/compare/v0.12.0...master
+[0.12.0]: https://gitlab.com/arctic-fox/spectator/-/compare/v0.11.7...v0.12.0
 [0.11.7]: https://gitlab.com/arctic-fox/spectator/-/compare/v0.11.6...v0.11.7
 [0.11.6]: https://gitlab.com/arctic-fox/spectator/-/compare/v0.11.5...v0.11.6
 [0.11.5]: https://gitlab.com/arctic-fox/spectator/-/compare/v0.11.4...v0.11.5
diff --git a/README.md b/README.md
index 323b4ca..00b5eb9 100644
--- a/README.md
+++ b/README.md
@@ -25,7 +25,7 @@ Add this to your application's `shard.yml`:
 development_dependencies:
   spectator:
     gitlab: arctic-fox/spectator
-    version: ~> 0.11.0
+    version: ~> 0.12.0
 ```
 
 Usage
diff --git a/shard.yml b/shard.yml
index 048953c..f364f0f 100644
--- a/shard.yml
+++ b/shard.yml
@@ -1,5 +1,5 @@
 name: spectator
-version: 0.11.7
+version: 0.12.0
 description: |
   Feature-rich testing framework for Crystal inspired by RSpec.
 
diff --git a/spec/issues/github_issue_55_spec.cr b/spec/issues/github_issue_55_spec.cr
new file mode 100644
index 0000000..92c2b42
--- /dev/null
+++ b/spec/issues/github_issue_55_spec.cr
@@ -0,0 +1,48 @@
+require "../spec_helper"
+
+Spectator.describe "GitHub Issue #55" do
+  GROUP_NAME = "CallCenter"
+
+  let(name) { "TimeTravel" }
+  let(source) { "my.time.travel.experiment" }
+
+  class Analytics(T)
+    property start_time = Time.local
+    property end_time = Time.local
+
+    def initialize(@brain_talker : T)
+    end
+
+    def instrument(*, name, source, &)
+      @brain_talker.send(payload: {
+        :group  => GROUP_NAME,
+        :name   => name,
+        :source => source,
+        :start  => start_time,
+        :end    => end_time,
+      }, action: "analytics")
+    end
+  end
+
+  double(:brain_talker, send: nil)
+
+  let(brain_talker) { double(:brain_talker) }
+  let(analytics) { Analytics.new(brain_talker) }
+
+  it "tracks the time it takes to run the block" do
+    analytics.start_time = expected_start_time = Time.local
+    expected_end_time = expected_start_time + 10.seconds
+    analytics.end_time = expected_end_time + 0.5.seconds # Offset to ensure non-exact match.
+
+    analytics.instrument(name: name, source: source) do
+    end
+
+    expect(brain_talker).to have_received(:send).with(payload: {
+      :group  => GROUP_NAME,
+      :name   => name,
+      :source => source,
+      :start  => expected_start_time,
+      :end    => be_within(1.second).of(expected_end_time),
+    }, action: "analytics")
+  end
+end
diff --git a/src/spectator/matchers/matcher.cr b/src/spectator/matchers/matcher.cr
index e54e55e..05adb81 100644
--- a/src/spectator/matchers/matcher.cr
+++ b/src/spectator/matchers/matcher.cr
@@ -1,3 +1,4 @@
+require "../value"
 require "./match_data"
 
 module Spectator::Matchers
@@ -22,6 +23,19 @@ module Spectator::Matchers
     # A successful match with `#match` should normally fail for this method, and vice-versa.
     abstract def negated_match(actual : Expression(T)) : MatchData forall T
 
+    # Compares a matcher against a value.
+    # Enables composable matchers.
+    def ===(actual : Expression(T)) : Bool
+      match(actual).matched?
+    end
+
+    # Compares a matcher against a value.
+    # Enables composable matchers.
+    def ===(other) : Bool
+      expression = Value.new(other)
+      match(expression).matched?
+    end
+
     private def match_data_description(actual : Expression(T)) : String forall T
       match_data_description(actual.label)
     end
diff --git a/src/spectator/matchers/range_matcher.cr b/src/spectator/matchers/range_matcher.cr
index 8c31810..8a9a307 100644
--- a/src/spectator/matchers/range_matcher.cr
+++ b/src/spectator/matchers/range_matcher.cr
@@ -29,7 +29,26 @@ module Spectator::Matchers
 
     # Checks whether the matcher is satisfied with the expression given to it.
     private def match?(actual : Expression(T)) : Bool forall T
-      expected.value.includes?(actual.value)
+      actual_value = actual.value
+      expected_value = expected.value
+      if expected_value.is_a?(Range) && actual_value.is_a?(Comparable)
+        return match_impl?(expected_value, actual_value)
+      end
+      return false unless actual_value.is_a?(Comparable(typeof(expected_value.begin)))
+      expected_value.includes?(actual_value)
+    end
+
+    private def match_impl?(expected_value : Range(B, E), actual_value : Comparable(B)) : Bool forall B, E
+      expected_value.includes?(actual_value)
+    end
+
+    private def match_impl?(expected_value : Range(B, E), actual_value : T) : Bool forall B, E, T
+      return false unless actual_value.is_a?(B) || actual_value.is_a?(Comparable(B))
+      expected_value.includes?(actual_value)
+    end
+
+    private def match_impl?(expected_value : Range(Number, Number), actual_value : Number) : Bool
+      expected_value.includes?(actual_value)
     end
 
     # Message displayed when the matcher isn't satisfied.