[luatex] Glyph nodes

[Florêncio Neves]

Hi,

I understand how to create a glyph node containing a character
specified by its Unicode number (by saying “node.new("glyph")” and
setting its “char” field).  Now, is it possible (or going to be
possible eventually) to create a node containing a glyph that lives in
the font's private area and therefore has no Unicode?

Looking into, say, the TG Pagella Math font, I see that its
\rightarrow has an extensible variant, whose right extreme is a
component named “arrowright.rt”, and I would like to insert this glyph
in a document.

Thanks.