File: Bridge.sol
513:         if (
514:             _message.data.length >= 4 && // msg can be empty
515:             bytes4(_message.data) !=
516:             IMessageInvocable.onMessageInvocation.selector &&
517:             _message.to.isContract()
518:         ) {
519:             success_ = false; 
520:         } else {
521:             (success_, ) = ExcessivelySafeCall.excessivelySafeCall(
522:                 _message.to,
523:                 _gasLimit,
524:                 _message.value,
525:                 64, // return max 64 bytes
526:                 _message.data
527:             );
528:         }
