Note that a single script can't safely use your module twice. This means that any modules that try to use your module can't be safely used with any other such modules. I don't know what your module does, but it seems quite unfortunate to me.

I'd probably have three packages. Here is a simplistic example:

package Your::Module::Bytes;
use bytes;
do $INC{"Your/Module.pm"} . ".pl";
1;
[download]

and

package Your::Module::Unicode;
no bytes;
do $INC{"Your/Module.pm"} . ".pl";
1;
[download]

and

package Your::Module;
sub import {
    # require the desired submodule
    # dispatch import to that submodule
}
[download]

Note, I'd have to test to make sure that 'use bytes' affects the code included via do, but I believe that it does.

I'm also a bit curious what particular effect of 'use bytes' you need. I thought that such was mostly of use for the earliest versions of Perl Unicode support.

                - tye