@SlackHQ I understand why you're showing this warning (and I think it's good!), but is there any chance you could make an exception for @github PRs?
Slack channels don't have a monopoly on the hash character after all 
pic.twitter.com/cL9KYKEYc5
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It only happens when the link text starts with a # -- presumably because it looks like a channel link.
Ah, we see what you mean! This is something we'd have to have a noodle on, thanks for the feedback, Benjamin. 
