The official release notes for the following release is certainly a clear official statement.

https://www.python.org/downloads/release/python-370/

“The insertion-order preservation nature of dict objects is now an official part of the Python language spec.” (June 27, 2018)

I knew about it, because everyone was talking about it. The origination of the actual information is irrelevant. It was basically interesting gossip for a few weeks.

The ruling is the very first and only line from the link:

> Make it so. "Dict keeps insertion order" is the ruling. Thanks!