It seems we have (seemingly) random failures on RTD.

Some of these are the known memory issue: recreating my doc environment used about 1.4 GB of RAM, which might be too much for RTD, even with the extended memory.

Much more often is a timeout when building the docs but I can't reproduce them locally. Any ideas?
Edit: This really is random, I tried rerunning and the build passed.

Also, a warning:

proj_create: init=epsg:/init=IGNF: syntax not supported in non-PROJ4 emulation mode