Kaya Unalmis

> Also it looks like #1290 makes some changes/updates to the `Bounce2D` apis, would be good to do all of that here Done. The only user facing change is to...

Can you add a test?

This will cause merge conflicts with all my open PRs, so could we wait to merge this?

it would cause one that looks simple to resolve

I read `R.L. Dewar, S.R. Hudson, Stellarator symmetry, doi 10.1016/S0167-2789(97)00216-9`. Recall stellarator symmetry is a property of a curvilinear coordinate system, $(\rho, \theta, \zeta)$, such that $f(\rho, \theta, \zeta) =...

I won't get around to doing the other checkboxes, at least for foreseeable future.

https://en.wikipedia.org/wiki/Gradient#Jacobian

Remove `@pytest.mark.xfail(reason="GitHub issue 1127.")` from `tests/test_configuration.py::TestGetSurfaces::test_get_zeta_surface` once resolved.

Note discussed in dev meeting: if redesigning to propagate `nan` for quantities that can't be computed, then make sure `surface_integral` class doesn't mask out all nan quantities. Just mask out...

Either there or separate is fine