Danil Zagoskin

> override the handling of already implemented extension handling which I do not think is a good idea. Yep, overriding stock handler is a way to shoot into own foot....

@robwalch I don't understand what "[Not a Contribution](https://www.apache.org/licenses/LICENSE-2.0)" means for me. Should I add anything in the commit message?

#6392 is sufficient for our needs, and I don't plan to continue work on custom extensions.

Hi! I did this researching available options, and erf didn't fit my current use case. Feel free to modify or close my PRs. Sorry for bothering without intention to really...