Hoorray! The other doctest error was even easier to fix: It has been a new test, and I simply had a typo in it.
Because of #11339 and #10903, I had to change some lines in the code. In order to make the changes more easily visible, I attached the new patches under a new name, so that you can compare them with the old patches.
Could you please have a look whether we can return to the positive review?
Apply trac4539_libplural_rel10903.patch trac4539_pickling_rel10903.patch trac4539_normal_forms_rel10903.patch trac4539_fix_docs_rel10903.patch