Differences between implemented and described in standard short method definition.

[yernende]

If a property definition has the form of a FunctionDeclaration without the keyword function it is a non-enumerable, non-writable, non-configurable data property definition whose name is the function name. This is called a method definition.

But defined in such way function is writable, enumerable, configurable.

If a property definition is the above form of FunctionDeclaration or is a get or set property definition the comma that separates it from the following property definition may be omitted.

But error occurs when such syntax is used.

Source: http://wiki.ecmascript.org/doku.php?id=harmony:object_literals#object_literal_property_shorthands

[yernende]

That specification has been deprecated