AaronBallman wrote:

> > Wondering if we should have a toString() version that does this 
> > automatically,
> 
> Yes, I think either a `toStringWithDigitSeparators` function, or an overload 
> taking an enum rather than a whole bunch of bool would improve this code a 
> lot.

Should we come up with a new format specifier for the diagnostics engine so 
that the author of the diagnostic can opt in to the additional formatting? My 
concern with doing this in general is that some numbers really don't need/want 
the separators so it seems like an opt-in would be better and if we make the 
opt-in via the diagnostic string itself, nobody has to do anything special to 
emit the diagnostic.

https://github.com/llvm/llvm-project/pull/117763
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