MAINT: Simplify element setting and use it for filling

This slightly modifies the behaviour of `arr.fill()` to be
`arr.fill(scalar)`, i.e. match `arr1d[0] = scalar`, rather than
`arr.fill(np.asarray(scalar))`, which subtely different!
(Note that object was already special cased to have the scalar
logic.)

Otherwise, `PyArray_Pack` is now the actual, full featured, "scalar"
assignment logic.  It is a bit strange due to that quantity/masked
array issue, but there is nothing to be done about it.
The simplifications in `PyArray_AssignFromCache` should not cause
any change in practice, because non 0-D arrays would have been
rejected earlier on in that path.
(Basically, it does not need the full `PyArray_Pack` logic, but that
is fine, I intially split the two, but consolidated them again.)

0 files changed, 0 insertions, 0 deletions