I designed a new command. But I found a problem.
We have the command [\useinterlinespaceparameter],
I thought it would work like \usealignparameter or \usebodyfontparameter,
But in the actual testing process, the command does not seem to work at all.
% Therefore, I used \dosetupcheckedinterlinespace.
In addition,
I found that there is also [\useinterlinespaceparameter] in the footnote.
it also can't work.
Although we can make additional settings through \setups.
Or maybe is there something wrong with [\useinterlinespaceparameter]?
%%%%%%
\unprotect
\let\sys_language\language
\installnamespace {userlanguage}
\installcommandhandler \????userlanguage {userlanguage} \????userlanguage
\setupuserlanguage[en][
% interlinespace=,
indenting=,]
\setupuserlanguage[cn][
% interlinespace=,
indenting={yes,2em},]
\tolerant\protected\def\userlanguage#*[#1]#*[#2]#*%
{\edef\currentuserlanguage{#1}%
\ifarguments\or\or
\setuplanguage[#1][#2]%
\setupuserlanguage[#1][#2]\fi
\sys_language[#1]%
\ifhmode\else\par
\edef\p_language_interlinespace{\userlanguageparameter\c!interlinespace}%
\useindentingparameter\userlanguageparameter
% \useinterlinespaceparameter\userlanguageparameter% not work
\dosetupcheckedinterlinespace\p_language_interlinespace% work
\fi
\lettonothing\currentuserlanguage}
\protect
\starttext
{\userlanguage[cn]How about \CONTEXT's apostrophes?
{\userlanguage[en]How about \CONTEXT's apostrophes?}}
{\userlanguage[cn][interlinespace=42pt]\ss\input knuthmath \par}
{\userlanguage[en][interlinespace=22pt]\tt\input knuthmath \par}
\input knuthmath
\stoptext
%%%%%%
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