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Saleem Abdulrasool
e00fe865d8
`extension P.Protocol` extends a protocol's metatype, but it was stored as an extension of `P` plus a side `IsMetatypeExtension` bit to recover what was written. Represent the written type faithfully and derive metatype- extension-ness from it, so the bit — in memory and in the serialized `ExtensionLayout` record — is no longer needed.