Set metadata when we load casks from the source API.
Set `@tap_git_head` manually.
Also, allow `auto_update` to receive false.
This is only done for consistency.
Stop double printing the `kext` caveat.
Handle Array elements correctly when substituting
path elements in artifacts. This affected how the
Uninstall Signal keys were evaluated (they are
represented as arrays of arrays).
c19017c6bd