civil: helpers to work with dates: Range, Min, Max?

[evanj]

I'm writing some Go programs that coordinate a bunch of fairly complex queries, and work with tables. I've found it useful to reuse the civil.Date type. As part of this, I've written some "helper" utilities, like a Range type and a Min/Max function. Would this be welcomed upstream into the civil package? If so, I'm happy to post my code as a Gerrit CL. If not, feel free to close this: I can also see the argument that this isn't directly used by google-cloud-go, so it shouldn't be supported by this team. I won't be offended, I just thought it could be useful to others.

This is similar to feature requests like #1609 and #1145, which are requesting adding "new" functionality to this package.

[tbpg]

I'm inclined to not add this directly to the civil package. I'm not entirely opposed, but I'm also hesitant to extend the API if there isn't much demand. Of course, helpers might be good in a separate package.

Thank you for filing this issue and not just sending the CL. We really do appreciate it.

[evanj]

Makes sense to me! I just thought I would offer in case there was interest. civil is pretty useful, it feels like a package that belongs in a golang/x repo!