The REALLY bad thing about Python lists ..

[Florian Weimer]

Greg Ewing <greg at cosc.canterbury.ac.nz> writes:

> If you know that the operands will never be negative, declare them
> as unsigned so that the compiler has the chance to optimise. Or give
> the language another operator that complains about negative numbers.

Or use a language which has distinct integer types (i.e. integer types
with no automatic conversion between them).  Of course, this can lead
to type inflation, but in my experience, it helps to avoid a lot of
silly mistakes.