For subprocess.popen, text is a synonym for universal_newlines, added in python 3.7.
Are you planning to submit a patch for this?
I assume so, because you didn't mention where the problem was. :D
Pull request: https://github.com/WebKit/WebKit/pull/10114
Committed 260357@main (cccd00688012): <https://commits.webkit.org/260357@main> Reviewed commits have been landed. Closing PR #10114 and removing active labels.