Our apologies, you’re quite right, this change wasn’t flagged in the release notes for version 3.0.0, which is when it was introduced1. This is the relevant commit, merged as part of this monster pull request, which overhauled a lot of the backend handling for our Python scripts – there were many changes in this pull request, which is probably why this specific change was overlooked for the release notes.
Hopefully that’s the information you were after?
1It’s also in 3.0_RC4, but this version should never have been released – my mistake.