[Dev-luatex] incompatible \meaning of \mathchar command

[Heiko Oberdiek]

Hello,

\meaning produces a different output for luatex for
commands, defined by \mathchardef, test file for
iniTeX/plain/latex:

  \catcode`\{=1
  \catcode`\}=2
  \mathchardef\x=0 %
  \immediate\write16{[\meaning\x]}
  \csname @@end\endcsname\end

Result for "luatex --ini":
  [\mathchar"0000]
All other TeX compilers (tex/pdftex/xetex) don't
print leading zeros:
  [\mathchar"0]

Is this on purpose or an accident/bug?

Yours sincerely
  Heiko Oberdiek