Clamp scale in bc_is_zero_for_scale to n_scale - #220
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Number::compare() may request a scale greater than the stored scale of a zero result when the opposite operand has a larger scale. The helper then walked past the shorter digit buffer. Clamp the requested scale to the digits stored in the number.
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bc_is_zero_for_scale walked n_len+scale digits without clamping scale to n_scale. Opposite-sign Number::compare with an explicit scale can call it when one operand is shorter, reading past the digit buffer. Match bc_is_near_zero and clamp first.