[Types-sig] const (was: PyDL RFC 0.02)

[Paul Prescod]

skaller wrote:
> 
> ...
>         I know, but that is my point: it isn't consistent
> with a model in which checking is applied to _names_:

Yes it is. Readonly-ness is part of an object's interface. We could make
ReadOnlyMapping types, ReadOnlyFile types, ReadOnlyList types,
ReadOnlyBankAccount types and so forth. It makes more sense to me,
however, to separate out ReadOnly-ness because it is so pervasive. But
not for version 1.

 Paul Prescod