Fix GH-16337: Use-after-free in SplHeap #16346
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We introduce a new flag to indicate when a heap or priority queue is write-locked. In principle we could've used SPL_HEAP_CORRUPTED too, but that won't be descriptive to users (and it's a lie too).
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We introduce a new flag to indicate when a heap or priority queue is write-locked. In principle we could've used SPL_HEAP_CORRUPTED too, but that won't be descriptive to users (and it's a lie too).