Comment 2 for bug 1221844

The one question I have is this use case: let's say the channel alias has changed, but the user gives a specific build number via the cli, e.g. --build 47. Should we respect the '47' or clobber it with build 0? For now the easiest thing to do is to clobber it. I can see how to implement respecting the explicit command line option, but I suspect this isn't a use case we'll care about much, so I'm not going to implement that. Just something to keep in mind if it ever crops up.