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20 hours ago history edited egreg CC BY-SA 4.0
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yesterday comment added egreg @Niranjan See tex.stackexchange.com/a/47372/4427. It has to do with robust command, not with protected ones.
yesterday comment added Niranjan Unrelated, but why is \letting a robust command risky? We often see constructs like \cs_new_protected:Npn \__foo: { foo } followed by \cs_gset_eq:NN \foo \__foo:. Isn't it the same?
yesterday history answered egreg CC BY-SA 4.0