Michael,
Your PEP doesn't spell out what happens when a binary and a decimal
number are the input for a numerical operator. I believe you said
that this would be an unconditional error.
But I foresee serious problems. Most standard library modules use
numbers. Most of the modules using numbers occasionally use a literal
(e.g. 0 or 1). According to your PEP, literals in module files ending
with .py default to binary. This means that almost any use of a
standard library module from your "dpython" will fail as soon as a
literal is used.
I can't believe that this will work satisfactorily.
Another example of the kind of problem your approach runs into: what
should the type of len("abc") be? 3d or 3b? Should it depend on the
default mode?
I suppose sequence indexing has to accept decimal as well as binary
integers as indexes -- certainly in a decimal program you will want to
be able to use decimal integers for indexes.
The whole thing seems screwed.
--Guido van Rossum (home page: http://www.python.org/~guido/)
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