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_xotcl1_to_internal {checkoptions} {
set options [list]
foreach option $checkoptions {
if {$option eq "invar"} {
lappend options "object-invar"
} elseif {$option eq "instinvar"} {
lappend options "class-invar"
} else {
lappend options $option
}
}
return $options
}