nl_tokens: serializeAttribute can be used to customize how DS . attr properties are serialized
pl_tokens: function ( record , json , key , attribute ) { var attrs = get ( this , 'attrs' ) ; var value = get ( record , key ) , type = attribute . type ; if ( type ) { var transform = this . transformFor ( type ) ; value = transform . serialize ( value ) ; } // if provided, use the mapping provided by `attrs` in // the serializer <mask> = attrs && attrs [ key ] || ( this . keyForAttribute ? this . keyForAttribute ( key ) : key ) ; json [ key ] = value ; }