fix expandtabs overflow detection to be consistent and not rely on signed overflow
merge 3.2
add Ian Beer
merge 3.2
use https docs url (#21115)
merge 3.2
remove directory mode check from makedirs (closes #21082)
merge 3.2 (#21082)
fix versionchanged version
merge 3.2
minor docfix (reported at docs@python.org) trace.py argument is --count not --counts