#1059542 groff-base: eqn mathml output doesn't understand left floor/right floor (or \[rf])

Package:
groff-base
Source:
groff-base
Description:
GNU troff text-formatting system (base system components)
Submitter:
наб
Date:
2023-12-28 02:45:02 UTC
Severity:
normal
Tags:
#1059542#5
Date:
2023-12-28 00:04:22 UTC
From:
To:
Dear Maintainer,

I'm trying to assemble some equations.
MathML is convenient for high-res renders and embedding.

One such is:
  w = left floor l 39 over 40 right floor

When rendering images with eqn2graph and groff -Thtml (both attached),
this yields the expected ⌊ and ⌋ wrapping.

However, when rendering with eqn -TMathML and groff -Txhtml (likewise),
this yields "w = floor l³⁹⁄₄₉ floor". Also \[lf] and \[lf] are "unknown
eqn/troff special char [rl]f", but they obviously ought to be given that
they are understood by groff.

Best,
наб