Stephan Hügel

I think everyone is is busy at the moment, so no worries. Thanks for the pointer about the tree structure – I'll do some digging when I get the chance.

Ah, so that means you _can't_ re-orient an RFC 7946 planar polygon based on area (because both windings are valid in `d3-geo`, with effects as Philippe and you have explained)?...

I won't be able to reproduce this under WSL2 as I don't have access to a windows machine, but I can try to reproduce it under Linux and / or...

Well, I can trigger a segfault with that data…

Just as a matter of interest, are you using the (slower!) `ctypes` functions for a reason? Switching to `from convertbng.cutil import convert_bng` causes the test to pass on my machine.

No prob! I'm going to leave this open for now as there's clearly something wrong with my `ctypes` code.

I really don't, having no experience of Freebsd whatsoever. From a look at the traceback, the problem seems to be with Cython, which is surprising since the cython in the...

Just to confirm: - you can't reproduce the error on earlier versions of Ubuntu, using the same coordinate - you can't reproduce the error on Ubuntu 16.04, using different coordinates...

Hmmm that's extremely confusing. If you change your import to `from convertbng.cutil import convert_lonlat` is the error triggered?

If it's an x86 CPU, there's no reason it shouldn't work, although a dump of the system info might help. I haven't had a chance to try to reproduce this...