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diff --git a/tex/context/base/mkiv/syst-lua.mkxl b/tex/context/base/mkiv/syst-lua.mkxl
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+%D \module
+%D   [       file=syst-lua,
+%D        version=2008.01.25,
+%D          title=\CONTEXT\ System Macros,
+%D       subtitle=Helper macros based on \LUA,
+%D         author=Hans Hagen,
+%D           date=\currentdate,
+%D      copyright={PRAGMA ADE \& \CONTEXT\ Development Team}]
+%C
+%C This module is part of the \CONTEXT\ macro||package and is
+%C therefore copyrighted by \PRAGMA. See mreadme.pdf for
+%C details.
+
+\registerctxluafile{syst-lua}{}
+
+\unprotect
+
+\def\expdoifelse#1#2{\clf_doifelsesame{#1}{#2}}
+\def\expdoif    #1#2{\clf_doifsame    {#1}{#2}}
+\def\expdoifnot #1#2{\clf_doifnotsame {#1}{#2}}
+
+%D Here is variant using a brainwave of the 12\high{+} hour \quotation {Long Road
+%D Out of Eden}\footnote {Eden being Backo\TeX\ 2018, where the virtues of the \type
+%D {\expanded} primitive were mentioned in talks.} trip. For now I don't really see
+%D other useful applications.
+
+\def\expandeddoifelse#1#2{\iftok{#1}{#2}\expandafter\firstoftwoarguments\else\expandafter\secondoftwoarguments\fi}
+\def\expandeddoif    #1#2{\iftok{#1}{#2}\expandafter\firstofoneargument \else\expandafter\gobbleoneargument   \fi}
+\def\expandeddoifnot #1#2{\iftok{#1}{#2}\expandafter\gobbleoneargument  \else\expandafter\firstofoneargument  \fi}
+
+% \testfeatureonce{100000}{\doifelse{hello world}{here i am}{}}           % 0.3
+% \testfeatureonce{100000}{\expandabledoifelse{hello world}{here i am}{}} % 1.5
+
+\def\expdoifelsecommon#1#2{\clf_doifelsecommon{#1}{#2}}
+\def\expdoifelseinset #1#2{\clf_doifelseinset {#1}{#2}}
+
+\def\expdoifcommonelse\expdoifelsecommon
+\def\expdoifinsetelse \expdoifelseinset
+
+%D We define these here, just in case. This permits \typefile {self} otherwise
+%D nested b|/|e sep problems.
+
+\def\luastringsep{===}
+
+\edef\!!bs{[\luastringsep[}
+\edef\!!es{]\luastringsep]}
+
+\unexpanded\def\writestatus#1#2{\clf_writestatus{#1}{#2}}
+
+%D We can omit the tex.ctxcatcodes here as nowadays we seldom change the regime at
+%D the \TEX\ end:
+
+%def\luaexpr#1{\ctxlua{context  (tostring(#1))}}   % more efficient:
+\def\luaexpr#1{\ctxlua{tex.print(tostring(#1))}} % no use is shortcutting has to be compiled
+
+%D But as we only use write 16 we could as well do all in \LUA\ and ignore the rest.
+%D Okay, we still can do writes here but only when not blocked.
+
+\let\syst_write_execute\clf_execute % always {...}
+
+\protect \endinput