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🐛 Fix SequenceSet#[] with valid positive range.begin but invalid negative range.end - #776
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October 3, 2026 00:33
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When slicing with a positive...negative range, where the range ends prior to the beginning of the set, this incorrectly set `max` to the _last_ value in the set, without regarding the sign of the range end. This converts both `set[start..end]` and `set[start..-end]` into `set[start..]` when the range end is out of range, which is correct for positive range end, but clearly incorrect for negative range end.
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SequenceSet#slice(pos..too_low_neg)SequenceSet#[] for range with valid positive begin, but invalid negative end
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SequenceSet#[] for range with valid positive begin, but invalid negative endSequenceSet#[] with valid positive range.begin but invalid negative range.end
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When slicing with a
positive..negativerange, where the range ends prior to the beginning of the set,SequenceSet#sliceincorrectly setmaxto the last value in the set, without regarding the sign of the range end. This converted bothset[first..last]andset[first..-last]intoset[first..]when the range end is out of range, which is correct for positive range end, but clearly incorrect for negative range end.This PR fixes that, by treating a missing negative
maxas0, e.g: identical toset[first...0]. Assumingfirst.abs <= cardinality, this will return an empty set.