Anchorage API reference
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    Variable TCB_ONLY_MEMORY_FIELDSConst

    TCB_ONLY_MEMORY_FIELDS: readonly ["threadId", "resourceId"] = ...

    The memory-id fields no client body may name — the TCB_ONLY_CREATE_FIELDS doctrine applied to memory: a client that picks its own threadId/resourceId picks whose memory it reads, so these are minted server-side or not at all.