If set, send the current topic value and timestamp for channels during
burst. This generally only makes sense for hubs to use, and it causes
a large increase in net.burst size.
+
+CHANNELLEN
+ * Type: integer
+ * Default: 200
+
+This is the allowed length of locally created channels. It may not be
+larger than the CHANNELLEN #define. Like the NICKLEN feature, this is
+intended to ease changes in channel name length across a network.