I spoke too soon: *aeson* induces *blaze-builder* & *dlist* -- both are pretty long term established and stable - I say include 'em both. *cgi* 3001.1.8.4 induces *MonadCatchIO-mtl* & *extensible-exceptions* - this is more problematic: - *extensible-exceptions* hasn't been needed since GHC 7, and just reexports stuff into a different place. I don't think that should be in the platform. - *MonadCatchIO-mtl* is one of several approaches to re-mapping extensible exceptions into *mtl*. While none is settled practice yet, this one is probably a dead end as it uses the older block/unblock idiom rather than the now preferred mask idiom. I'm planning holding *cgi* back to 3001.1.7.5 to avoid these two packages. thoughts always welcome! - Mark