Possible to use COMP_WORDBREAKS here?

[tomberek]

          Possible to use COMP_WORDBREAKS here?

COMP_WORDBREAKS=${COMP_WORDBREAKS//=}

Alternatively... do we edit this?

_get_comp_words_by_ref -n ':=&' words cword cur

note: I've not tested this yet.

Originally posted by @tomberek in https://github.com/NixOS/nix/issues/11240#issuecomment-2274184510