Homebrew 4.0
I wanted to bring to your attention that Homebrew 4.0.0 has been released, and you can find the announcement post at here. I highly recommend reading it.
The most significant change since 3.6.0 enables significantly faster Homebrew-maintained tap updates by migrating from Git-cloned taps to JSON downloads.
You can eliminate the following taps to conserve space.
$ brew untap homebrew/core
Untapping homebrew/core...
Untapped 3 commands and 6506 formulae (7,033 files, 655.0MB).
$ brew untap homebrew/cask
Untapping homebrew/cask...
Untapped 4154 casks (4,235 files, 356.6MB).