perf(parser): Reduce lookups for conflicts #4572
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We already need to lookup every present-arg for conflicts, so we might as well cache it ahead of time. This let's us move some operations to be immutable so we can more easily cache other lookups. For me, this gave a 70% speed improvement for clap-rs#4516 with mixed results on normal benchmarks
Didn't actually see much of a gain because this isn't in a hot loop but thought I'd keep it.
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We already need to lookup every present-arg for conflicts, so we might
as well cache it ahead of time. This let's us move some operations to
be immutable so we can more easily cache other lookups.
For me, this gave a 70% speed improvement for #4516 with mixed results
on normal benchmarks