On 11/21/2020 2:09 AM, Pablo Rodriguez wrote:
On 11/20/20 10:52 PM, Wolfgang Schuster wrote:
[...]
Optional arguments (e.g. plus/minus values for \hskip) for commands are
handled different in LMTX but it was always recommended to add \relax
after the last value.

Hi Wolfgang,

the same would apply to \vskip, wouldn’t it?
also for \hrule and \vrule (and in pdftex/luatex some backend related primitives); primitives like \hbox have their keyword scan terminated by a leftbrace token

Hans

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