Georgi Popov

There is a `verify` command in [pip-compile-multi](https://pip-compile-multi.readthedocs.io/en/latest/features.html#check-that-pip-compile-multi-was-run-after-changes-in-in-file) (a tool based on pip-compile) which works similarly to @AndydeCleyre 's suggestion with MD5, however it's based on the hash of the input...

> Also, if an already pinned version gets revoked from the repository, the same input would generate new output. I'm guessing we'd want the check to "fail" in this case,...

There is a similar issue also with `obj.member = None; maybe(obj).member.get()`. I think the root cause is `maybe(None).get()` raises. To me it's more logical to have `maybe(None).get() == None`. This...