NOTE: I don't have an M1 Mac, so the only testing I can do is with
a non-`/usr/local` Intel Homebrew installation. This should take
care of "`cc` shim forbids `/usr/local` if Homebrew not installed
under `/usr/local`", which is the default setup for M1 Homebrew.
Forgot that base formula names need to be unique, otherwise `brew upgrade` picks up the core tap formula over this replacement, leading to:
```
$ brew upgrade
[...]
==> Upgrading sshfs 2.10_2 -> 3.7.1
Error: sshfs has been disabled because it requires FUSE!
```
