Reduce slice allocations during unique insertions #705
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Just reduce some really easy to avoid slice allocations for every unique
insertion:
No reason to have
requiredV3states
allocated every time a new uniqueopts is validated. It never changes.
Leave
missingStates
unallocated by default. Most of the time aunique insertion will have have no missing unique states, so this
skips a unique allocation completely the overwhelmingly majority of
the time.