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a3e917afe1
We were selectively requiring the tap.rb file in a few places for performance reasons. The main method we were referencing was the `Tap.cmd_directories` method which uses `Pathname` and the `TAP_DIRECTORY` constant internally. `Tap.cmd_directories` is mostly used in the `Commands` module and that is loaded very early on in the program so it made sense to move that command to that module. To facilitate that I moved the `TAP_DIRECTORY` constant to the top-level and renamed it to `HOMEBREW_TAP_DIRECTORY`. It now lies in the tap_constants.rb file. A nice bonus of this refactor is that it speeds up loading external commands since the tap.rb file is no longer required by default in those cases.