compress.go: Add back comment about Safari compat layer being disabled

Author: nhooyr

Diff for: compress.go

@@ -12,6 +12,12 @@ import (
 
 // CompressionMode represents the modes available to the deflate extension.
 // See https://tools.ietf.org/html/rfc7692
+//
+// A compatibility layer is implemented for the older deflate-frame extension used
+// by safari. See https://tools.ietf.org/html/draft-tyoshino-hybi-websocket-perframe-deflate-06
+// It will work the same in every way except that we cannot signal to the peer we
+// want to use no context takeover on our side, we can only signal that they should.
+// But it is currently disabled due to Safari bugs. See https://github.com/nhooyr/websocket/issues/218
 type CompressionMode int
 
 const (