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BigDecimal stores digits in groups of nine and skips leading all-zero
groups, so the first group of 1e-10 begins at the 10th decimal place.
When the rounding position fell before the first group, :up truncated
to 0: BigDecimal("1e-10").round(0, :up) returned 0 instead of 1.
Co-authored-by: Claude Opus 5.5 <noreply@anthropic.com>
wtn
changed the title
round(n, :up) returning 0 for some nonzero values
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BigDecimal stores digits in groups of nine and skips leading all-zero groups, so the first group of
1e-10begins at the 10th decimal place. When the rounding position fell before the first group,:uptruncated to 0.