| ⇢ | A | MessageId added | |
| ⇢ | A | InjectMessageIdHeaderTransport added |
| ⇢ | A | MessageId::__construct() added | |
| ⇢ | A | InjectMessageIdHeaderTransport::__construct() added | |
| ⇢ | A | InjectMessageIdHeaderTransport::send() added | |
| ⇢ | A | MessageId::getName() added | |
| ⇢ | A | MessageId::getValue() added | |
| ⇢ | A | MessageId::newRandom() added | |
| ⇢ | A | Boundary::newRandom() added | |
| A | ↛ | Boundary::newRandomBoundary() removed |