8.5 Syntax – {*}

Basic use:

eval [list {*}$cmdprefix {*}$systemargs {*}$userargs]

Let

set cmdprefix {cmd foo}

set systemargs {this and that}

set userargs {and the other}

→ eval [list cmd foo this and that and the other]

ꙮWorks. Even with spaces in words. Concise.