🐛 Backport SequenceSet bugfixes (#376, #377) to v0.4 #378
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Most methods convert their inputs into an array of range tuples. For efficiency, SequenceSet inputs just use the internal `@tuples` array directly. Unfortunately, the internal tuples arrays were also reused, which could cause a variety of bugs. Fortunately, the only bug I experienced was that adding a frozen SequenceSet would result in frozen tuples being added to a mutable set. But this could also result in modifications to one SequenceSet affecting another SequenceSet!
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SequenceSet#appendwhen its@stringis nil #376