Reject format spec with width above i32::MAX by changjoon-park · Pull Request #7707 · RustPython/RustPython

CPython rejects format-spec widths that exceed Py_ssize_t::MAX with
ValueError: Too many decimal digits in format string. RustPython's
FormatSpec::_parse only capped precision (via parse_precision); width
was accepted up to usize::MAX, so values like sys.maxsize + 1 silently
produced an effectively-ignored width.

Reject any width above i32::MAX with FormatSpecError::DecimalDigitsTooMany,
matching the existing precision cap and producing the byte-identical
ValueError wording.

Unmasks test_str.StrTest.test_format_huge_width.