Jay Krell

If we are talking about the same warnings/errors, this does appear to be a preexisting condition. If having someone/me fix that first is a precondition for accepting my PR, I...

.tail is a dilema. On desktop, .tail can tailcall anything, sometimes a perf gain but sometimes a large perf loss. You sometimes have to chose stack or cycles.

Yeah, C++ maybe has advantages here, it already has the iterators (cursor) and the range delete, though there also inconsistencies between global upper_bound / lower_bound and set/map::upper_bound/lower_bound -- set/map force...