[BUG] Failure to conver awkward Masked array to numpy about boost-histogram

[henryiii]

We currently don't really support directly using awkward arrays. I'd like to, and it's planned, but calling to_numpy first is correct. And even if we support it, we'd basically be doing exactly that; we require dense regular arrays to fill. That might be a restriction we can relax a bit after boostorg/histogram#364 which sounds exciting. Ideally I'd like full C++23 ndspan support. ;)

(still won't help with masking, though, but would at least remove the "dense" conversion requirement)

[HDembinski]

boostorg/histogram#364 is not really related to this. I am just making some internal tool easier to use, this does not have an external effect.

[HDembinski]

I think it would be very useful to support filling with awkward arrays if that can be achieved without introducing a dependency on awkward. fill() could check whether to_numpy() exists and call it.