guile-json is an optional dependency for Guix. See
the manual and makefiles.
I see, didn't know.
We can't do this
I'm not sure that this is correct.
From the manual:
Installing Guile-JSON will allow you to use the guix
import pypi command (see Section 6.5 [Invoking guix
import], page 75). It is of interest primarily for
developers and not for casual users.
CPAN, GEM and CARGO importers also use guile-json. If
a developer is using importers I think he can install guile-json
since most importers use it. (guix import utils) is only used
by importers, so people that don't want to use importers
can continue without using guile-json. To put it in perspective
guile-json is 100KB (guix size only displays MB).