Stdlib: guard array_map/array_filter enum identity parity (#5564)

[PurHur]

Summary

• Closes Stdlib: array_map()/array_filter() on enum arrays must preserve enum case objects (ext/standard/array.c) #5564 — array_map() / array_filter() already preserve enum case objects on master (VM + JIT match Zend).
• Adds compliance PHPT guards and a maintainer repro script so the scalarization regression cannot return.

Root cause

Fixed upstream in enum-aware array iteration / callback paths; issue was open without regression tests.

Verification

# Issue repro
./script/docker-exec.sh -- bash -lc 'source script/php-env.sh && cd /compiler && php test/repro/array_map_filter_enum_identity.php && php bin/vm.php test/repro/array_map_filter_enum_identity.php && php bin/jit.php test/repro/array_map_filter_enum_identity.php'

# Targeted PHPUnit
./script/phpunit.sh --filter 'array_map_enum|array_filter_enum'

Output (2026-07-12):

array (
  0 => \E::A,
  1 => \E::B,
)
array (
  0 => \E::A,
)

(VM + JIT identical to Zend)

PHPUnit: OK (5 tests, 5 assertions)

Made with Cursor