[Raymond]
> I've started working on an implementation and several choices arise:
>
> 1) Reject scalar with a TypeError if scalar is a Counter
> 2) Reject scalar with a TypeError if scalar is a Mapping
> 3) Reject scalar with a TypeError if scalar is a Collection
> 4) Reject scalar with a TypeError if scalar is Sized (has a __len__ method).
>
> I lean toward rejecting all things Sized because _everyone_ knows that
> scalars aren't sized ;-)
Hard to know how gonzo to get :-(
_Scalar = (Sized, Container, Iterable)): # has __len__, __getitem__, or __iter__
...
if isinstance(arg, _Scalar):
raise TypeError ...
would also reject things like generator expressions. But ... those
would blow up anyway, when multiplication was attempted.
So, ya! Sticking to Sized sounds good :-)
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