Do we merge qt6 branches onto 5.1 or master ?

[denisri]

I have branches for Qt6 / PyQt6 porting in 3 projects. Branches have started before the 5.1 release and are maintained sync'ed to 5.1 branches. But they include significant changes in the python bindings which need to be further tested, and which are of course not binary compatible with the current 5.1.
However we have never been really focused on binary compatibility (for which we don't have tools to check it), and there are certainly already binary incompatible changes between 5.1.0 and 5.1.1.
The cleanest would be to merge onto master, but this would postpone any release compatible with Qt6 for... years... Plus, and maybe more importantly, it would probably make later merges between 5.1 and master more difficult.
So I wonder if I should merge to 5.1 or to master.
Any opinions ?

[denisri]

Master is cleaner, so let's go for master.