Enforce ordered packets when using constant NetworkedMultiplayerPeer.TRANSFER_MODE_UNRELIABLE (thus behaving similarly to constant NetworkedMultiplayerPeer.TRANSFER_MODE_UNRELIABLE_ORDERED). This is the only way to use ordering with the RPC system.
See Implementation
Enforce ordered packets when using constant NetworkedMultiplayerPeer.TRANSFER_MODE_UNRELIABLE (thus behaving similarly to constant NetworkedMultiplayerPeer.TRANSFER_MODE_UNRELIABLE_ORDERED). This is the only way to use ordering with the RPC system.