Customer Request: Allow PR and Issue share the incremental creation number

Problem Definition

Users unable to use only "#<Numbers>" to refer a PR or an Issue.
But instead, users need to enter "pull request #<Numbers>" and "issue #<Numbers>".

Suggested Solution

If PR and Issue are allowed to share the incremental creation number, users will able to use "#<Numbers>" to refer certain PR or Issue.

For an example:

#1: issue
#2: issue
#3: PR
#4: issue
#5: PR

This will allow user to refer the PR by using "#3" instead of "pull request #3"

Just to add:

1. one of your popular competitors does it this way;

2. personally find it much easier to juggle a bunch of issues and PRs when I don't have to think if that's issue #3 or pull request #3 and can just think of "#3".

This is a neat feature, but I think it's unlikely to happen anytime soon - it's one of those things that is great if you think of it when you first build both features, but quite difficult to implement once you've already built them and people are using them (with relatively low benefit).

On the plus side, to make things slightly easier we recently started linkifying PR #<number> in addition to pull request #<number> - hopefully that helps.