How to change the default "Squash & Merge" commit message?

I want this same behavior (PR description in the commit message) for regular merges as well - not just squash and merge. It’s sane and should at least be a configurable option. Bitbucket did this, when our org switched to github I just assumed it did the same thing. It’s very frustrating if the PR description cannot be included in the commit message.

Yes please! I would like this feature!
Especially for auto-merging, I think the PR Description should be the default commit description when merging.

+1, it is needed and I would like to have it as well

+1 (and some more chars for 20)