Axel Rauschmayer wrote:
Multiple inheritance is where things become interesting. In order to implement some kind of mixin or trait mechanism for JavaScript, you would need the ability to copy private members.
Which .{ can do. The argument is that this is safe against unintended name leaks because while the LHS (mixin-derived) is an expression, the RHS (mixin-base) is a literal.
Is having only the literal-RHS-only special form too restrictive? It could be wrapped in an API usable from downrev script, but this means implementors of mixins must use ES6 even though consumers can use pre-ES6.
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