UnitStrippedWarning when calling numpy ufuncs

[natezb]

Commit 4be294c introduced UnitStrippedWarning, and it is now extremely common for me to see this warning (I assume every time I use a ufunc).

For example, simply calling np.cos on a quantity will produce the warning. Is there some other way I'm supposed to use numpy ufuncs with quantities, or is this a bug?

If this is a limitation of the current ufunc implementation, is this something that the new __array_ufunc__ api can help with?