[luatex] extended registers for \insert

David Carlisle d.p.carlisle at gmail.com
Mon Jun 29 22:57:29 CEST 2015

etex and xetex can not use registers higher than 256 with \insert, however
the following plain tex works without error with luatex




Can this be relied on, and luatex will accept the full box register
range with \insert?

If so could \insert be added to the manual in section 2.4 where \box \count etc
are listed as accepting 16-bit numbers,



(It would be nice to avoid the ugly \reserveinserts trick used with etex to
preserve space for inserts below 256, but I'm wary of using
undocumented features)

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