Fix phpstan/phpstan#13526: False positive with array_key_exists and union types #5103

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phpstan-bot wants to merge 135 commits into phpstan:2.1.x from phpstan-bot:create-pull-request/patch-9jd3jcc

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Fix phpstan/phpstan#13526: False positive with array_key_exists and union types #5103

Proper Claude Fix Issue workflow (for the fork)

GitHub Advanced Security / poutine succeeded Mar 1, 2026 in 2s

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