typechecked(string) should have more consistent return type

[dbarnett]

Currently if you call typechecked on a string module name, it has case-by-case behavior to sometimes return the original string and sometimes return the resolved module:

typechecked('requests') → <module 'requests'>
typechecked('requests') → 'requests'

Could we simplify to make it unconditionally return the value that was passed in, str→str, module→module, class→class, etc?

[Stewori]

I agree to that solution. Accepting a string in place of the module was meant for convenience, not to complicate static typechecking. I think nothing depends on this particular current behavior. Please go ahead and change it as you proposed.