From 9cfa92ede838bf33a1b6b1f7a2806ad49dcb0fbf Mon Sep 17 00:00:00 2001
From: Daniel Oaks <daniel@danieloaks.net>
Date: Mon, 17 Apr 2017 23:05:24 +1000
Subject: [PATCH] modes: Avoid unnecessarily sending unknown mode numerics

---
 irc/modes.go | 11 ++++++++++-
 1 file changed, 10 insertions(+), 1 deletion(-)

diff --git a/irc/modes.go b/irc/modes.go
index 93030a7e..117360f8 100644
--- a/irc/modes.go
+++ b/irc/modes.go
@@ -361,7 +361,16 @@ func ParseChannelModeChanges(params ...string) (ModeChanges, map[rune]bool) {
 						continue
 					}
 				}
-			default:
+			}
+
+			var isKnown bool
+			for _, supportedMode := range SupportedChannelModes {
+				if rune(supportedMode) == mode {
+					isKnown = true
+					break
+				}
+			}
+			if !isKnown {
 				unknown[mode] = true
 			}