nl_tokens: private instance methods ------------------------
pl_tokens: function invokeCallback ( cb , invokeMethod , valueOrReason , promise , type ) { var cbValue , cbError , errorThrown ; try { cbValue = cb [ invokeMethod ] ( null , valueOrReason ) ; } catch ( err ) { errorThrown = true , cbError = err ; } // send return values in promise chain to downstream promise if ( type === 'fulfill' ) { promise . _values = this . _values . concat ( [ valueOrReason ] ) ; } if ( ! errorThrown && cbValue && typeof cbValue . <mask> === 'function' ) { cbValue . then ( function ( value ) { promise . fulfill ( value ) ; } , function ( reason ) { promise . reject ( reason ) ; } ) ; } else { ! errorThrown ? promise . fulfill ( cbValue ) : promise . reject ( cbError ) ; } }