use a uint64 in the AllowConnectionWindowIncrease callback

config_test.go

@@ -103,7 +103,7 @@ var _ = Describe("Config", func() {
 			var calledAcceptToken, calledAllowConnectionWindowIncrease bool
 			c1 := &Config{
 				AcceptToken:                   func(_ net.Addr, _ *Token) bool { calledAcceptToken = true; return true },
-				AllowConnectionWindowIncrease: func(Session, int) bool { calledAllowConnectionWindowIncrease = true; return true },
+				AllowConnectionWindowIncrease: func(Session, uint64) bool { calledAllowConnectionWindowIncrease = true; return true },
 			}
 			c2 := c1.Clone()
 			c2.AcceptToken(&net.UDPAddr{}, &Token{})

interface.go

@@ -270,7 +270,7 @@ type Config struct {
 	// to increase the connection flow control window.
 	// If set, the caller can prevent an increase of the window. Typically, it would do so to
 	// limit the memory usage.
-	AllowConnectionWindowIncrease func(sess Session, delta int) bool
+	AllowConnectionWindowIncrease func(sess Session, delta uint64) bool
 	// MaxIncomingStreams is the maximum number of concurrent bidirectional streams that a peer is allowed to open.
 	// Values above 2^60 are invalid.
 	// If not set, it will default to 100.

session.go

@@ -510,7 +510,7 @@ func (s *session) preSetup() {
 			if s.config.AllowConnectionWindowIncrease == nil {
 				return true
 			}
-			return s.config.AllowConnectionWindowIncrease(s, int(size))
+			return s.config.AllowConnectionWindowIncrease(s, uint64(size))
 		},
 		s.rttStats,
 		s.logger,