A small package with bindings to a function in that
assigns a column width to Unicode characters.
This is the function that tells your terminal to make Chinese
characters two columns wide while making the letter 'a' but
one column wide.
In addition, a little utility is provided that constructs a
table of widths by character and a listing of character ranges
with the same width. On different systems, `wcwidth` may
assign different widths to the same character for some obscure