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this fixes an issue where base can be out of range on a raspberry pi.

Summary of Changes

Hello @Asmod4n, I'm Gemini Code Assist¹! I'm currently reviewing this pull request and will post my feedback shortly. In the meantime, here's a summary to help you and other reviewers quickly get up to speed!

I've addressed a specific issue affecting BigInt operations on Raspberry Pi devices. The problem stemmed from an incorrect interpretation of the 'base' parameter when creating a BigInt from a string, which could result in an out-of-range error. My change ensures that this parameter is correctly cast to a signed 8-bit integer, thereby resolving the bug and improving the reliability of BigInt handling on affected platforms.

Highlights

BigInt Type Casting Fix: I've adjusted the type casting for the base parameter within the mrb_bint_new_str function call. Previously, s[1] was passed directly, which could lead to an out-of-range issue for the base value on certain platforms, specifically Raspberry Pi. By explicitly casting it to (int8_t), I ensure that the value is correctly interpreted as a signed 8-bit integer, resolving the reported bug.

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