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While researching another issue, @jakebailey noticed this statement takes an exceedingly long time to type check. With the caching added in this PR, the check time for the statement drops from 250ms to about zero on my machine.
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Honestly surprised we call this with the same arguments so many times - but I guess at least twice with the same args is basically guaranteed, since signature inference is 2-pass.
My mistake, I likely jumped to conclusions when I saw this in the release notes as a likely candidate since I use quite a lot of unions internally.
@Andarist and I have been looking at which of the changes from that day could have caused such a large increase in type instantiations and check time and haven't been able to identify it yet.
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While researching another issue, @jakebailey noticed this statement takes an exceedingly long time to type check. With the caching added in this PR, the check time for the statement drops from 250ms to about zero on my machine.