Currently, ANSI escape codes are always stripped by this library. However, there are plenty of contexts where one might be interested in the 'real' character count of a string, but where ANSI escape codes do not have a special semantic meaning, and so stripping them would result in an incorrect character count.

IMO, the ANSI code stripping should either be opt-in, or possibly even considered out-of-scope for this module entirely - since one can also just call strip-ansi on the string before passing it in, or whichever stripping function is appropriate for their specific semantic context.