We propose to revert 5 changes:

• Removed tostring/fromstring methods in array.array and base64 modules • Removed collections aliases to ABC classes • Removed fractions.gcd() function (which is similar to math.gcd()) • Remove "U" mode of open(): having to use io.open() just for Python 2 makes the code uglier • Removed old plistlib API: 2.7 doesn't have the new API

+1 from me. We don't gain anything by removing these in 3.9 instead of 3.10, so it is perfectly reasonable to ease the burden on users by deferring them for another release. Raymond