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This is how both TeX and m4 do quoting by default so presumably common when they were created (mid-eighties and early seventies respectively IIRC)


It’s an ASCII approximation of the proper typography for single quotes (except when you’d use inverted quotes for some reason, not sure how common it is in English).

Similarly, LaTeX uses `` and ‘’ for double quotes because the opening and closing symbols are not the same in properly typeset texts.




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