[PNG] Meeting topics? Cancel?

Hello everyone,

Sorry for the late email. I lost track of the days. Normally, I want to
sort out topics for discussion early so people have time to think about it.

I'm looking at emails now and maybe we don't have much to discuss, anyway.
There are still some topics, but they might be short & sweet--good fit for
email or GitHub issues, perhaps:

   - Cosmin wanted to discuss non-normative recommendations for decoders
   that encounter broken PNG files. We already cleaned this up a bit in Third
   Edition. Maybe that cleanup was sufficient?
   - John Bowler mentioned a recursive PNG parsing with iHDR, iDAT, and
   lABL chunks, allowing a keyword registry to allow generic data. This should
   probably go into a GitHub issue.
   - Gain maps were published, but non-free. So we're still waiting on
   that. Gain curves are not yet published, I believe?

Does anyone else have topics to discuss?
Should these topics be in a meeting or should we cancel?

Thanks!