Fixes issue #438

[tstoeter]

Python range does not include stop position. In this case it is 9, but should be 10.

[will-moore]

Thanks.
Fix looks good and corresponds to the help docstring 👍

However, briefly looking at the usage of debug level I don't see that you'll get much more detailed output with level 9 compared with 8.

[joshmoore]

Re-open to make use of #440

[joshmoore]

Thanks, @tstoeter. Good point, @will-moore. I assume it's not overly critical though to reduce that now.