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http://dev.w3.org/2006/webapi/WebIDL/#idl-serializers Spec prose mentions serializers of the form: [[ serializer = { attribute }; serializer = { inherit, attribute }; ]] But these are not accounted for in the grammar productions.
It's not clear to me that we need all this serializer complexity, fwiw. Are there actual use cases for it?
Consolidating serializer issues into a simplification issue at https://github.com/heycam/webidl/issues/188