🥅 Improve SequenceSet frozen errors #331
Merged
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Previously, SequenceSet modification methods would raise a frozen error when it updated its internal data structure (currently implemented as an array of arrays), which was "can't modify frozen Array: [int, int]". This was unexpected, confusing, and misleading.
This changes the SequenceSet modification methods to raise the expected FrozenError prior to attempting to modify the internal data structure.