isAscii package:text-short

Test whether ShortText contains only ASCII code-points (i.e. only U+0000 through U+007F). This is a more efficient version of all isAscii.

>>> isAscii ""
True

>>> isAscii "abc\NUL"
True

>>> isAscii "abcd€"
False

isAscii t == all (< '\x80') t