Should I send patch against 2-3-stable or master

Question

I am trying to find a way to contribute back to rails. I was thinking I should validate if this patch https://rails.lighthouseapp.com/projects/8994/tickets/4154-expires_now-broken works or not.

I was able to validate the problem. The problem still exists in 2.3.5 and in 2-3-stable branch of rails.

I was not able to apply his patch at 2-3-stable branch of rails . Also the patch failed for master branch.

Looked at the diff and manually changed the code and the new code solves the bug.

Now if I want to attach my patch to the ticket should I create my patch against 2-3-stable branch or master branch?

I believe master is more closely aligned with rails3 changes.