Re: [heycam/webidl] Can [Replaceable] be used on namespace members? (#572)

Hmm.  So namespaces only allow readonly attributes.  But `[Replaceable]` could in theory still make sense.

That said, in practice it doesn't make sense to me; `[Replaceable]` is basically a backwards-compat hack, and there's no need for that on namespaces....

There is definitely a  spec bug here, though.  https://heycam.github.io/webidl/#define-the-attributes can have a namespace as _definition_ and in step 3 does https://heycam.github.io/webidl/#dfn-attribute-setter with that namespace as _target_ if that happens, but https://heycam.github.io/webidl/#dfn-attribute-setter assumes that _target_ is not a namespace.  We need to fix that.  Probably by just having step 1 of https://heycam.github.io/webidl/#dfn-attribute-setter return **undefined** if _target_ is a namespace.

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