Why std.stdio and not std.io ?

[Nils Hensel]

Derek Parnell schrieb:
> "std.stdio" is the Standard I/O module in the "std" package. It allows for
> such things as "std.extio" which might be an Extended I/O module but still
> in the "std" package. In other words "stdio" describes an I/O module as
> 'standard' and "std." describes a package as 'standard'.

Following that logic std.math should be called std.stdmath because it 
might get extended by std.extmath?
Why don't just leave out the prefix for standard modules?

Nils