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When returning an UNDEF value, it actually becomes NULL.
The following code took this into account:
28344e0445/ext/opcache/jit/zend_jit_trace.c (L2196-L2199)
But the stack does not update the type to NULL, causing a mismatch.
Closes GH-16784.
Co-authored-by: Dmitry Stogov <dmitry@zend.com>