The above discussion looks like it reached a conclusion: nobody seems to object to having sphgeom depend on utils. Work can proceed on DM-7342 on that basis. This is done.

Actually I'd rather we didn't. sphgeom is the only dependency that daf_butler has and I've been trying to remove utils from daf_butler. This would negate all that dependency clean up in daf_butler.

Why does daf_butler need to be dependency free?

Because we have this notion that other projects might want to use it and we don't want to make that harder than it should be. We have previously talked about putting sphgeom on pypi.

I guess I feel that, as a point of principle, Rubin code ought to be able to use Rubin's own utils package; otherwise, it just feels like we're gratuitously making things harder for ourselves than we need to. If that's a problem for daf_butler, though, maybe reopen this ticket (or file another one), and we can thrash out the issues.