Replace IANA derived tables with something else?
We use IANA IDNA tables from https://www.iana.org/assignments/idna-tables-12.0.0/ but their process to update them is slow. Unicode 15 was just published and waiting for IANA to update their tables to support new code points in Unicode 15 is bad service. We had this issue in the past as well -- see discussion in #77 (closed).
Consider deriving these tables ourselves using modern Unicode versions, or find another source for more uptodate derived tables. UTC publish some stuff at https://www.unicode.org/Public/idna/idna2008derived/ but I'm not sure if that is what we need. I have an old repository 'idna2008-tables' which derives these tables, perhaps we should get it up and running (after comparing the output with IANA tables for historic versions). I'm opening this issue to document the background, and to start the process of doing something about it.