KarpelesLab / goro / 25773633050

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vm: int inc/dec fast path must skip ref-bound slots

The fast path replaces the slot pointer with a fresh non-ref ZVal.
For a slot bound by reference (a by-ref param or a foreach &\$v),
that breaks the ref binding: subsequent writes don't propagate to
the caller's variable. Add the !IsRef() check so ref slots fall
through to incDecLocal, which calls DoInc that mutates in-place.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

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