kvlog/writer.go
func (w *Writer) Suppress(levels ...string) {
	p := w.Levels()
	for _, level := range levels {
		p[level] = "hide"
	}
	w.SetLevels(p)
}
func (w *Writer) Suppress(levels ...string) {
	p := w.Levels()
	for _, level := range levels {
		p[level] = "hide"
	}
	w.SetLevels(p)
}
// Suppress instructs the writer to suppress any message with the specified level.