Register a boolean type as an alias of bool

lib/dry/types/core.rb

@@ -87,6 +87,9 @@ module Types
     register("strict.bool", bool)
     register("bool", bool)
 
+    register("boolean", bool)
+    register("strict.boolean", bool)
+
     register("any", Any)
     register("nominal.any", Any)
     register("strict.any", Any)

spec/dry/types/core_spec.rb

@@ -50,6 +50,26 @@
     end
   end
 
+  describe "with Boolean" do
+    let(:boolean) { Dry::Types["strict.boolean"] }
+
+    it_behaves_like "Dry::Types::Nominal without primitive" do
+      let(:type) { boolean }
+    end
+
+    it "accepts true object" do
+      expect(boolean[true]).to be(true)
+    end
+
+    it "accepts false object" do
+      expect(boolean[false]).to be(false)
+    end
+
+    it "raises when input is not true or false" do
+      expect { boolean["false"] }.to raise_error(Dry::Types::ConstraintError, /"false" violates constraints/)
+    end
+  end
+
   describe "with Date" do
     let(:date) { Dry::Types["strict.date"] }