"curl" is the binary, while "cURL" is the umbrella project.

`@private` hides classes from documentation altogether, while `@api
private` merely marks it as a private API.

We use only one sha type right now.

Needed for https://github.com/Homebrew/brew/pull/10186

- Use default `custom-prefix` label on macOS ARM (as `/usr/local` is
  not the default).
- Add architecture (or Rosetta) to analytics event label.
- Don't send minor versions on Big Sur.
- Remove defunct `HOMEBREW_OSX_VERSION` reference.

Expand on #10153 to provide an in-code comment (in case someone goes to
change this in future).

More deprecations, disabling and removal for Homebrew 2.7.0.

This probably has to wait until 2.7.0 now and will require a bunch of
formula changes/deprecations but we should probably start moving in this
direction given we're not installing any of these on our CI any more.

This reverts commit 11445e0f.

According to reports, XNU’s CPU family identifier previously used for
the Westmere family (which Homebrew mislabels as the Arrandale family)
is now being reused for one of Apple’s M1 SoC models.

Resolve the conflict by splitting the list of CPU families and adding a
microarchitecture check.

Sources for the values:

- https://github.com/Homebrew/brew/issues/7857#issuecomment-728739049
- https://en.wikipedia.org/wiki/Comparison_of_ARMv8-A_cores
- Direct messages

Co-authored-by: Mike McQuaid <mike@mikemcquaid.com>