Member Junction
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    SchemaNameRule:
        | "Malformed"
        | "ReservedByPlatform"
        | "ReservedByMJ"
        | "MJNamespace"

    Which of ValidateSchemaName's rules refused a name. Malformed covers both the empty/whitespace-only and the leading/trailing-whitespace branches — neither is a naming policy decision, so MJ claims no ownership of the name: a caller must not describe it as one MJ is protecting, only as one nothing can be addressed by.