add default of None to backend declarations [#764]

(cherry picked from commit ecdc63b866856d7a38f73484722226f29b95224f)

diff --git a/dns/asyncquery.pyi b/dns/asyncquery.pyi
index 21ef60dd43c79162672cba7d4d7e504af2b7a4b7..a03434c2ceed19004db3357a80bf0c8a8fca6efb 100644 (file)
--- a/dns/asyncquery.pyi
+++ b/dns/asyncquery.pyi
@@ -19,7 +19,7 @@ async def udp(q : message.Message, where : str,
               one_rr_per_rrset : Optional[bool] = False,
               ignore_trailing : Optional[bool] = False,
               sock : Optional[asyncbackend.DatagramSocket] = None,
-              backend : Optional[asyncbackend.Backend]) -> message.Message:
+              backend : Optional[asyncbackend.Backend] = None) -> message.Message:
     pass
 
 async def tcp(q : message.Message, where : str, timeout : float = None, port=53,
@@ -28,7 +28,7 @@ async def tcp(q : message.Message, where : str, timeout : float = None, port=53,
         one_rr_per_rrset : Optional[bool] = False,
         ignore_trailing : Optional[bool] = False,
         sock : Optional[asyncbackend.StreamSocket] = None,
-        backend : Optional[asyncbackend.Backend]) -> message.Message:
+        backend : Optional[asyncbackend.Backend] = None) -> message.Message:
     pass
 
 async def tls(q : message.Message, where : str,
@@ -37,7 +37,7 @@ async def tls(q : message.Message, where : str,
               one_rr_per_rrset : Optional[bool] = False,
               ignore_trailing : Optional[bool] = False,
               sock : Optional[asyncbackend.StreamSocket] = None,
-              backend : Optional[asyncbackend.Backend],
+              backend : Optional[asyncbackend.Backend] = None,
               ssl_context: Optional[ssl.SSLContext] = None,
               server_hostname: Optional[str] = None) -> message.Message:
     pass