after my octoberfest talk, robin crockett offered some interesting philosophy on "the right way to do glueing", using some concept of "partial map category", if i understand correctly ... i should find out more about this, and / or try to work some of it out ...

?? something about "rational function / map" as some sort of partial map .... ???? ..... ??? .... confusion here (?? ...) about ordinary vs birational algebraic geometry ?? .... ??? .....