🐛 Fix inconsistently frozen SequenceSet#[] result #458
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nevans
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This maybe isn't actually documented very well (or at all...) but most SequenceSet transform methods return a frozen result when +self+ is frozen and a mutable result when +self+ is mutable. Except +limit+ which always returns a frozen result. And (before this commit) +slice+, which inconsistently returned with matching frozen status when the result wasn't empty, but always returned a frozen set when the result _was_ empty. Adding these tests exposed a much more significant bug: `SequenceSet#xor` mutates the reciever.
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This maybe isn't actually documented very well (or at all...?) but most SequenceSet transform methods return a frozen result when
selfis frozen and a mutable result whenselfis mutable. Exceptlimitwhich always returns a frozen result. And (before this commit)slice, which inconsistently returned with matching frozen status when the result wasn't empty, but always returned a frozen set when the result was empty.(Adding these tests exposed a
much more significantbug:SequenceSet#xormutates the receivercrashes when the set is frozen: #457.)