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The ‘siunitx’ LaTeX package and Wikipedia are trying to convince me that an accepted typographical convention in English is to separate digits with “narrow gaps” instead of commas, like “12 000” instead of “12,000” (twelve thousands):
https://en.wikipedia.org/wiki/Wikipedia:Manual_of_Style/Dates_and_numbers#Grouping_of_digits

I don’t remember ever seeing narrow gaps for grouping in English but is it… common? preferred?

(LC_NUMERIC for en_* in glibc uses commas.)