Bug#820119: tidy reports valid NCR as invalid

Package: www.debian.org
Severity: wishlist

https://www.w3.org/International/questions/qa-controls#support
HTML, XHTML and XML 1.0 do not support the C0 range, 
except for HT (Horizontal Tabulation) U+0009, LF (Line Feed) U+000A, 
and CR (Carriage Return) U+000D. 
The C1 range is supported, i.e. you can encode the controls directly 
or represent them as NCRs (Numeric Character References).

*
https://www.w3.org/International/questions/qa-controls#background
The control codes in the range U+0080-U+009F are known as the "C1" range.

unfortunately no option seems to eliminate this :(
latest source use the same code (line 1165-)
https://github.com/htacg/tidy-html5/blob/master/src/lexer.c