Improve inference for some regex captures #41666
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Add some typeasserts to places where an element of a
m.capturesis loaded, and it's known that it's a match. This prevents useless union-splitting, which shows up in static analysis.There are more places in Base where the same pattern of
m.captures[1]occurs, but many of these are in places where it's unlikely people are hitting them doing static analysis, such as in TerminalMenus, InteractiveUtils, Markdown and so on.