Splitting a delimited string into multiple variables in one line with TCL split versus GetField

Not sure I completely understand, the result of a tcl split is a list:

set str "blah1-blah2-blah3"
set fields [split $str "-"]

You can then use this list as is, completely indexable:

log local0. [lindex $fields 0]
=blah1    

The getfield command is indeed an iRule-optimized "lindex-split"

set str "blah1-blah2-blah" 
log local0. [lindex [split $str "-"] 1]
=blah2

As far as proxy are concerned, a tcl list is really just an indexable string, so it's straight forward to return a list from a proc call:

proc test { var } {    
    return [split $var "-"]        
}            
set str "blah1-blah2-blah3"
set doit [call test $str]
log local0. [lindex $doit 2]    
=blah3