This procedure is defined in the server but not documented via ad_proc or proc_doc and may be intended as a private interface.
The procedure is defined as:
proc ::xotcl::checkoption_internal_to_xotcl1 {checkoptions} {
set options [list]
foreach option $checkoptions {
if {$option eq "object-invar"} {
lappend options "invar"
} elseif {$option eq "class-invar"} {
lappend options "instinvar"
} else {
lappend options $option
}
}
return $options
}