I have an ajax callback for typeahead of a taxonomy reference field. In the value part of the array I put the term with a beadcrumb, so if it's Lab, the value looks like
Dog > Sporting > Lab
The problem I'm having is the key. When I get to the validate function and dump the value of the reference field, the key I use in the select array is in the term->name field, and the term->tid field contains 'autocreate'. I've tried putting just the tid in the array key, then tid:title, title:tid, and finally I used the example (for node reference) in the example module's ajax typeahead example, which is
$matches[$term->name . " [$term->tid]"] = $name . $term->name;
($name is the taxonomy breadcrumb).