Revert "Fix mix with string keys ending in !" (#972)

Reverts #967

Author: joeldrapper

lib/phlex/helpers.rb

@@ -36,14 +36,7 @@ module Phlex::Helpers
 			end
 
 			result.transform_keys! do |key|
-				case key
-				when Symbol
-					key.end_with?("!") ? key.name.chop.to_sym : key
-				when String
-					key.end_with?("!") ? key.chop.to_sym : key
-				else
-					key
-				end
+				key.end_with?("!") ? key.name.chop.to_sym : key
 			end
 		end
 	end

quickdraw/helpers/mix.test.rb

@@ -65,16 +65,11 @@
 	assert_equal output, { class: ["foo", "bar"] }
 end
 
-test "override with symbol key" do
+test "override" do
 	output = mix({ class: "foo" }, { class!: "bar" })
 	assert_equal output, { class: "bar" }
 end
 
-test "override with string key" do
-	output = mix({ class: "foo" }, { "class!" => "bar" })
-	assert_equal output, { class: "bar" }
-end
-
 test "set + set" do
 	output = mix({ class: Set["foo"] }, { class: Set["bar"] })
 	assert_equal output, { class: Set["foo", "bar"] }