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All fast JavaScript VMs use some form of pointer tagging. V8 uses (compressed) tagged pointers and both JSC and Firefox used NaN-boxing. WasmGC has a i31ref as

by titzer 2y ago

All fast JavaScript VMs use some form of pointer tagging. V8 uses (compressed) tagged pointers and both JSC and Firefox used NaN-boxing. WasmGC has a i31ref as part of its reference hierarchy, which is implemented with pointer tagging.