[RUST] Add borrowed object node cast - #734
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Seven-Streams
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Sep 3, 2026
tqchen
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Sep 3, 2026
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This PR adds ObjectRefCore::as_node() for zero-copy borrowed object-node casts.
Checks such as is_zero currently clone an owning object handle before calling try_cast. This performs an atomic reference-count increment and decrement even though the caller only needs to inspect the node temporarily.
The new API checks the runtime type directly from the existing object header and returns a reference tied to the source handle. It does not clone the handle, construct an owning cast result, or update the reference count. Final node types, such as IntImmObj, use a fast exact type-index comparison.