Dear Unicoders,

Per Zach's suggestion I'm writing to clarify the origin of the width estimate table in P1868.

The table is based on Markus Kuhn's open-source implementation of `wcwidth()` and `wcswidth()` for Unicode (https://www.cl.cam.ac.uk/~mgk25/ucs/wcwidth.c) which is listed in the references. We translated it from code into a table form.

There are other implementations of display width estimation, some of which were overfit to particular terminals. The one by Kuhn was simple enough and gave reasonable results in tests which is why we used it.

Cheers,

Victor