GitLab

... and it will further become LookupByNode shortly, but that will be
a separate commit.

See the changelog for discussion; this had already been on the docket
for a while now.

Int is now basically all common stuff.  Now I'm really gonna quit.

Interestingly, the total line count isn't going down very fast.
108 insertions, 165 deletions, according to the git diff stat.
Evidentally the overhead of things opting into this is darn near
the amount of lines saved in many cases.

This one turns out to be different betweens scalars and recursives,
if in a small (and fortunately consistent) way.