nl_tokens: --- implements ------------------------------------------
pl_tokens: function DataType_Object_clone ( source , // @arg Any             - source object. depth , // @arg Integer = 0     - max depth, 0 is infinity. hook ) { // @arg Function = null - handle the unknown object. // @ret Any             - copied object. // @throw TypeError("DataCloneError: ...") // @desc Object with the reference -> deep copy //       Object without the reference -> shallow copy //       do not look prototype chain. //{@dev $valid ( $type ( depth , "Number|omit" ) , DataType_Object_clone , "depth" ) ; $valid ( $type ( <mask> , "Function|omit" ) , DataType_Object_clone , "hook" ) ; //}@dev return _clone ( source , depth || 0 , hook , 0 ) ; }