Stone.js API
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    Variable SUPPORTED_PROTOCOL_VERSIONSConst

    SUPPORTED_PROTOCOL_VERSIONS: readonly string[] = ...

    The protocol revisions this server answers to, newest first.

    A client states the revision it wants during initialize. A server that supports it answers with the same one; otherwise it answers with its own latest and lets the client decide whether to continue. Keeping the list explicit is what makes that negotiation honest.