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The 'except' attribute is a set of room IDs, which is then converted to a set of socket IDs in the computeExceptSids() method. That wasn't caught because both types are aliases for 'string', but Room could be extended to all primitive values in the future. Reference: https://developer.mozilla.org/en-US/docs/Glossary/Primitive Related: https://github.com/socketio/socket.io-adapter/issues/82