bugfix: handle overflow when decoding numbers. - #127
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Clear errno before strtoll() and fall back to floating-point parsing on ERANGE so overflowing integers are not silently clamped. Add regression tests for positive and negative overflow and subsequent integers.
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Clear errno before strtoll() and fall back to floating-point parsing on ERANGE so overflowing integers are not silently clamped. Add regression tests for positive and negative overflow and subsequent integers.