Fixes Homebrew's annoying upgrade/update behaviour, will break `update --merge` functionality but quite honestly, IDGAF.

.brew-fix.sh

brew() {
  local cmd=$1; shift
  if test "$cmd" = 'upgrade' || test "$cmd" = 'update'; then
    "__brew_update_or_upgrade" "$@"
  else
    command brew "$cmd" "$@"
  fi
}

__brew_update_or_upgrade() {
  local maybe_package=$1;
  if test -z "$maybe_package"; then
    command brew update
  else
    command brew upgrade "$maybe_package" "$@"
  fi 
}