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Update RangeFunctionReturnTypeExtension to include known integer ranges for keys #4251

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PrinsFrank wants to merge 1 commit into phpstan:2.1.x
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@PrinsFrank PrinsFrank commented Aug 20, 2025

Right now, the range function returns a list Type for large numbers. we can narrow this down, because we do actually know the upper and lower bounds of the keys, by subtracting the lower bound from the upper bound and dividing that by the step number.

I think this covers all scenarios, let me know if I've missed anything!

@PrinsFrank PrinsFrank force-pushed the range-returns-list-with-known-nr-of-elements branch from 783dac8 to 884429f Compare August 20, 2025 19:32
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staabm commented Aug 21, 2025
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Misses a type-inference test which fails without the patch using assertType

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