Another LMTX/MkIV difference, this time with expansion:

    \define\Align{yes}
    \starttext
    \startalignment[\Align]
         This works with MkIV but fails with LMTX, complaining: {\tt
         tex error on line 3 in file G:/expand.mkvi: The file ended
         when scanning an argument.}
    \blank
        It works in both when \tex{def} or \tex{defineexpandable} is
        used instead of \tex{define}.
    \blank
        What changed?
    \stopalignment
    \stoptext

It may well be that I have been abusing some laxity in MkIV and that 
LMTX is a bit stricter in what it accepts, but I would like to know if 
this is an expected difference.

-- 
Rik