lazyGridMap constructor crashes on UnboundedOctGrid

[dyerw]

This is because indices is undefined for unbounded grids. That makes sense, but then maybe the constructor should be constrained by FiniteGrid so this can't happen?

[mhwombat]

It might require some changes to the type design and definitions. It's been years since I worked on this code, so I'm not sure.

[dyerw]

Totally, no worries! Just thought I'd mark the issue for posterity because it confused me for a while.

The lib is really useful for my game project, thanks for making it!