\startluacode
  require("int_defcmd")
\stopluacode

\starttext
  \myCommand{Simple text}.\par

  \myCommand{\blank}

  % no problems with braces inside
  \myCommand{Text with {\it braces} inside}.\par

  % this fails, because there are brackets inside
  \myCommand{\blank[10pt]}

  % this does not fail, because of the double braces
  \myCommand{{\blank[10pt]}}

\stoptext
