Hello Ludo, > Currently ‘guix substitute’ implements the same policy has before, > which is to pick the smallest archive when several compression > methods are proposed. The next step will be to make that > configurable. > > Thoughts? Nice one! What do you have in mind to make it configurable? Pass the preferred compression types to the daemon and propagate it to "guix substitute"? Once we have better visibility on zstd, I think we should consider making those bindings mandatory for consistency with the other Guile compression libraries. Otherwise, the whole patchset seems fine :). Thanks, Mathieu