In general the correlation between byte length in UTF-8 and visual character width is only a weak one.

For example many european non-ASCII-characters are printed with visual width of only one character, but encoded as two bytes. The Euro sign € is even encoded as three bytes, and still printed with a width of only one.

In reply to Re^2: The “real length" of UTF8 strings by moritz
in thread The “real length" of UTF8 strings by Anonymous Monk

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