Python's numeric tower

[Roy Smith]

In article <539dbcbe$0$29988$c3e8da3$5496439d at news.astraweb.com>,
 Steven D'Aprano <steve+comp.lang.python at pearwood.info> wrote:

> On Sun, 15 Jun 2014 01:22:50 -0600, Ian Kelly wrote:
> 
> > On Sat, Jun 14, 2014 at 8:51 PM, Steven D'Aprano
> > <steve+comp.lang.python at pearwood.info> wrote:
> >> Does anyone know any examples of values or types from the standard
> >> library or well-known third-party libraries which satisfies
> >> isinstance(a, numbers.Number) but not isinstance(a, numbers.Complex)?
> > 
> >>>> issubclass(decimal.Decimal, numbers.Number)
> > True
> >>>> issubclass(decimal.Decimal, numbers.Complex)
> > False
> 
> Well, that surprises and disappoints me, but thank you for the answer.

Why would you expect Decimal to be a subclass of Complex?