KarpelesLab / goro / 25824933809

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vm: snapshot LHS in OpOpAssignLocal slow path before operator runs

A user-installed error handler captured via use(&$x) can mutate the
local slot during operand coercion (e.g. .= coercing an array to
string fires a Warning, the handler runs, modifies $x in place
through the shared ZVal). Without the snapshot the operator reads
the post-handler value instead of the pre-handler one (bug81705).
Only the slow path Dups; the int+=int and string.=string fast paths
above remain alloc-free.

Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>

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