[Matrix-SIG] Conversion of scalars.

[dlr@postbox.ius.cs.cmu.edu]

> [Much discussion of how to prevent upcasting of float arrays to
> double.]

Wasn't there a recent post promising clean ways to subclass Numpy
arrays? 

If there is a way to cleanly subclass arrays, could we get some
mileage out of creating a non-promoting subclass?  The non-promoting
version could define operators which type-check their arguments,
demote them if necessary, and then call the operators of the parent
class.

Or am I confused?
David