[fixup d9afb747e7f10de0a62f1db5c1df71712b7e01de]

[daladim]

Thanks for mock_instant!

Hi, a commit from April broke the build when the sync feature is enabled.
I've fixed it (it looks fine but disclaimer: I have not read all the logic from this file to double-check before committing)

[museun]

Oh, yes indeed that shouldn't return a duration. I remember catching that in the unit tests but I guess I forgot to rebase.

The sync reference module is just a mirror of the other one, but with a mutex involved l.

[museun]

And looking at the code, the OnceCell isn't needed as of like 6 months ago, Mutex::new is const.

As of today, rust 1.70 brought once cell into std so the external dep isn't required, but it's not needed because of the above info. Once I get to a computer I'll merge your fix and then remove that dep

[museun]

I've yanked the 0.3.0 release and published a 0.3.1 release

After debating, I won't remove the OnceCell code yet (it'd affect others parts of the code). and 1.70 is still far too new to have as a minimum version.

In the future I will be migrating to std::sync::OnceLock.

Thanks for the patch