[pull] master from php:master#383
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Since the executor needs to be active at this point, the only way you could get an UNDEF return value is by having an exception. Therefore, `!EG(exception)` is always false. The check doesn't make sense, remove it.
…lization All other code caters to dereferencing array elements, except the unserialize handler. This causes references to be present in the fixed array even though this seems not intentional as reference assign is otherwise impossible. On 8.5+ this causes an assertion failure. On 8.3+ this causes references to be present where they shouldn't be. Closes GH-20616.
* PHP-8.3: Fix GH-20614: SplFixedArray incorrectly handles references in deserialization
* PHP-8.4: Fix GH-20614: SplFixedArray incorrectly handles references in deserialization
* PHP-8.5: Fix GH-20614: SplFixedArray incorrectly handles references in deserialization
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