Bug report

• For string data, it infers string keys, but it should not
  • Problem is PHP's auto-casting of numeric values: https://3v4l.org/VQoSJQ#vnull
• Inference was ok prior 2.1.34

Code snippet that reproduces the problem

https://phpstan.org/r/b5fae275-672d-4795-be8e-490b19505397

Expected output

Dumped type: non-empty-array<array-key, int<1, max>>

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