nimble >= 0.14.0(i.e. nimble install nimble@#head) depends on isValidSha1Hashbeing supplied by std/sha1. So a related question/concern is whether the next gen nimble(lock files 🥳) will be compatible with future releases of Nim 1.2.x and 1.4.x?
We usually don't backport features so Nimble should emulate isValidSha1Hashfor older versions. And right now not even 1.6.0 supports Nimble lock-files, once we support it we can backport the patch, yes.