Trying to retrieve an array element with "false" as index should raise an error in strict mode

### Feature request

Hello, 

It would be nice that PHPStan raise an erreur in strict mode when trying to access an array element with "false" as index.

See
https://phpstan.org/r/1f14913d-366e-4b45-9b4b-e747fc48b7dd

Best regards,
Eric

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