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lang-bash
${(~j[|])names:r}treats|as an (extended) glob operator because of the~flag, but does not treat[and]specially in the expansion ofnamesbecause unquoted variable expansions are not subject to split+glob by default?${(~j[string])array}applies globsubst to that joinstringonly, while$~varapplies globsubst to the whole expansion (and$=vardoes splitting so$~=varin zsh is like the$varof sh, something you almost never want).