As you say, real software by and large doesn't care about tm_isdst any more. This is why we haven't bothered to issue a new TZDB release yet - nobody cares in the real world. But eventually when the next TZDB release comes out I'd like the tm_isdst flag to reflect better the intended rules by Greenland's government, as  we might as well do things right if it's easy. I expect will care about this except us TZDB nerds.

Makes perfect sense. I have no objections at all, just wanted to make it known that nobody noticed. :-)

The NEWS file does need a fix now, though; proposed patch attached.

Looks good.

Thanks for clarifying you position on this. Everything looks good then.