macOS live reloading documentation outdated

[kommen]

In the readme it says:

Note: This doesn't work on macOS 10.13+ (High Sierra and up). See Rust's issue #28794.

This seems outdated though, as the linked issue is already resolved.

[ubolonton]

It's not actually outdated. In older macOS versions, unloading used to work, with UB. Newer versions fixed that by disable unloading if there's a remote chance of UB.

I'll update the doc to clarify this point.