[luatex] \write16 (or 128) loosing tokens after null character

[jfbu]

Hi,

this might be the same issue than one with \scantokens
which was discussed some time ago on this list (lost the reference)

\catcode0 12

\def\x {\romannumeral`^^@ foo bar foo bar foo bar}

\catcode0 9

\message{\meaning\x}

\immediate\write128{\meaning\x}

\bye

If I compile with luatex I get (there is a null character after `
in the first line and there is nothing after ` in second line)

(./testlualog.tex macro:->\romannumeral `  foo bar foo bar foo bar
macro:->\romannumeral `
)

in the log, whereas with pdftex I get

(./testlualog.tex macro:->\romannumeral `^^@ foo bar foo bar foo bar
macro:->\romannumeral `^^@ foo bar foo bar foo bar
 )

Jean-François