A: test case
U: $.extend _H -> _H.mixin
U: deleted duplicate methods
U: $.isArray -> _H.isArray
U: $.isPlainObject -> _H.isPlainObject or @isPlainObject
U: $.isFunction -> _H.isFunction
U: $.camelCase -> _H.camelCase
U: $.type obj is "string" -> _H.isString and $.trim -> _H.trim
U: compiled files