const compress/gzip.DefaultCompression

4 uses

	compress/gzip (current package)
		gzip.go#L22: 	DefaultCompression = flate.DefaultCompression
		gzip.go#L50: 	z, _ := NewWriterLevel(w, DefaultCompression)

	google.golang.org/grpc
		rpc_util.go#L62: 	c, _ := NewGZIPCompressorWithLevel(gzip.DefaultCompression)
		rpc_util.go#L73: 	if level < gzip.DefaultCompression || level > gzip.BestCompression {