Write a function to enable more optimizations:

 * If the substring is the whole string and overallocation is disabled, just
   keep a reference to the string, don't copy characters
 * Avoid a call to the expensive _PyUnicode_FindMaxChar() function when
   possible

Add an unit test to ensure that text files are rejectect (with TypeError)

Add an unit test to ensure that text files are rejectect (with TypeError)

We don't put coverage directives in the stdlib, but anyone looking at a
coverage report for Random should see the comment and understand why the lines
aren't covered.

Patch by Victor Terrón.

This means we can remove our usage of qsort() than relied on undefined behavior.

-v/-vv that were lost in the transition to importlib.

category.

Thanks to Westley Martinez for trying to fix the issue and Atsuo
Ishimoto for an initial patch.

Patch by Roumen Petrov.

Patch by Denver Coneybeare with some test modifications by me.

Patch by Denver Coneybeare with some test modifications by me.