Handle initialize as a special case

Reference:
rspec/rspec-mocks#1324 (comment)

lib/muack/mock.rb

@@ -246,7 +246,13 @@ def __mock_super_with_kargs? object, method_name
         ::Kernel.instance_method(:method).bind(object).call(method_name).
         super_method
 
-      super_method && __mock_block_with_kargs?(super_method)
+      if super_method.owner == ::Class && super_method.name == :new
+        initialize_method = ::Class.instance_method(:instance_method).
+          bind(object).call(:initialize)
+        __mock_block_with_kargs?(initialize_method)
+      else
+        super_method && __mock_block_with_kargs?(super_method)
+      end
     end
 
     def __mock_block_with_kargs? block

test/test_keyargs.rb

@@ -108,4 +108,17 @@ def instance
       expect(Obj.say(a: 0)).eq(Obj.object_id)
     end
   end
+
+  would 'handle initialize via new' do
+    kargs_initialize = Class.new do
+      def initialize a:
+        @a = a
+      end
+      attr_reader :a
+    end
+
+    mock(kargs_initialize).new(a: 0)
+
+    expect(kargs_initialize.new(a: 0).a).eq(0)
+  end
 end