Cleanup check_cast. Fixes #21554 #21606
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This also makes the cast error messages somewhat more uniform.
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It seems to me that this might have non-local consequence, beyond just changing these error messages slightly, maybe just changing the internals of the cast checking would be more reliable?
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Unit structs aren't scalars. Unit enums aren't scalars. ((),) isn't a scalar. I checked the other places that use this function – they don't care.
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Ok, good; checking convinces me.
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This also makes the cast error messages somewhat more uniform.
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This also makes the cast error messages somewhat more uniform.