[Matrix-SIG] Conversion of scalars.

[Konrad Hinsen]

> 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.

That's certainly doable. Depending on how the subclassing will work
(is it via ExtensionTypes?), it could mean reimplementing all
arithmetic operations for non-promoting arrays. And C routines that
expect array arguments would perhaps refuse non-promoting array
arguments.
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