mdash

Can someone please help me with the correct set of option settings to cause
HTML-Tidy to retain certain entity encodings from input to output?
Specifically, I can't find the settings to retain "—" as "—" and
"–" as "–".  So far, no matter my choices it converts "—"
and "ndash;" from the input to a hyphen or dash on the output.  I've tried
"ascii-chars" set to "no" along with various other combinations to no avail.

Thanks

MJ