Is your feature request related to a problem? Please describe.
Since not long ago cargo test fails on my mac locally with standard library 6 tests failing. Couple of days ago a new test joined this pool of failing tests, this time a validity one. I want to make sure that macOS tests are also passing since there might be some technical differences. As I'm mainly driving macOS I can resolve any issues related to this platform.

Describe the solution you'd like
I'd like to add macOS job to our github workflow and fix all the errors that show up.