feat: small speed ups to unmarshall message creation (#27)

src/dbus_fast/_private/unmarshaller.py

@@ -318,6 +318,9 @@ def _read_body(self):
             signature=tree.signature,
             body=[self.read_argument(t) for t in tree.types] if self.body_len else [],
             serial=self.serial,
+            # The D-Bus implementation already validates the message,
+            # so we don't need to do it again.
+            validate=False,
         )
 
     def unmarshall(self):

src/dbus_fast/message.py

@@ -108,6 +108,7 @@ def __init__(
         signature: str = "",
         body: List[Any] = [],
         serial: int = 0,
+        validate: bool = True,
     ):
         self.destination = destination
         self.path = path
@@ -134,6 +135,8 @@ def __init__(
         self.body = body
         self.serial = serial
 
+        if not validate:
+            return
         if self.destination is not None:
             assert_bus_name_valid(self.destination)
         if self.interface is not None:

src/dbus_fast/message_bus.py

@@ -765,10 +765,10 @@ def _process_message(self, msg):
 
         if msg.message_type == MessageType.SIGNAL:
             if msg._matches(
+                member="NameOwnerChanged",  # least likely to match
                 sender="org.freedesktop.DBus",
                 path="/org/freedesktop/DBus",
                 interface="org.freedesktop.DBus",
-                member="NameOwnerChanged",
             ):
                 [name, old_owner, new_owner] = msg.body
                 if new_owner: