Data not converted to observable?

findAll defined as below converts raw data to object instances (Observables) correctly:

1. findAll: function(filter, success, error){
2. return $.ajax{
3. // my ajax options
   
4. }

findRecent defined int the same model returning the same data does NOT convert, data remains in its raw array format:

1. findRecent: function(filter, success, error){
2. return $.ajax{
3. // my ajax options
   
4. }

Is this normal behavior or a bug??