ufuncs on records should not be allowed unless they are explicitly overridden.

[jpivarski]

Unless explicitly overridden, ufuncs are not supposed to work on records. In v1:

>>> array = ak.Array([{"x": 1.0, "y": 1.1}, {"x": 2.0, "y": 2.2}])
>>> np.absolute(array)
Traceback (most recent call last):
...
  File "/home/jpivarski/irishep/awkward-1.0/awkward/_util.py", line 1058, in apply
    raise ValueError(
ValueError: cannot broadcast records in this type of operation

(https://github.com/scikit-hep/awkward-1.0/blob/1.9.0rc2/src/awkward/_util.py#L1060)

(that's good), but in v2:

>>> array = ak._v2.Array([{"x": 1.0, "y": 1.1}, {"x": 2.0, "y": 2.2}])
>>> np.absolute(array)
<Array [{x: 1, y: 1.1}, {x: 2, ...}] type='2 * {x: float64, y: float64}'>

(that's bad).

In v1, this was issue #457 and PR #510, which added:

https://github.com/scikit-hep/awkward-1.0/blob/779819e0405cd481dbae0976fc311f2f1d91d9b5/src/awkward/_util.py#L1057-L1061

It looks like the check was copied into v2:

https://github.com/scikit-hep/awkward-1.0/blob/779819e0405cd481dbae0976fc311f2f1d91d9b5/src/awkward/_v2/_broadcasting.py#L653-L656

but it's not being triggered in the above example for some reason.

Originally posted by @jpivarski in #1437 (comment)