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> which is (IMHO) a better choice

I know C++ added it 14 years after D :-) but I'm curious why you say ' is a better choice? I never read the papers proposing the feature, but the _ hasn't caused any problems for us, and I like it better myself.

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I use the quote separator for digit grouping on any occasion, i.e. also outside of computer code. There, we usually have non-monospaced fonts, for which the use of underscores is glaringly uglier compared to use of single quotes. I don't know if you took this design decision from somewhere else or not, but it was an inspired decision nevertheless.

Also, I'm glad and honoured to have a comment like yours in my history. Sorry for late reply.

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