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trie/bintrie: make IsEmpty kind-based

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Comparing against emptyRef (the single value makeRef(kindEmpty, 0))
only works because no other nodeRef with kindEmpty is ever constructed.
That invariant is easy to break if future code ever produces a
kindEmpty ref with nonzero index. Test the kind directly so any
kindEmpty ref reads as empty regardless of index.
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CPerezz 2026-04-19 22:15:48 +02:00
parent c08048eb84
commit d216942b7c
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trie/bintrie/node_ref.go
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@ -53,4 +53,4 @@ func (r nodeRef) Kind() nodeKind { return nodeKind(uint32(r) >> kindShift) }
// Index within the typed pool.
func (r nodeRef) Index() uint32 { return uint32(r) & indexMask }
func (r nodeRef) IsEmpty() bool { return r == emptyRef }
func (r nodeRef) IsEmpty() bool { return r.Kind() == kindEmpty }