glg.go
func (g *Glg) TagStringToLevel(tag string) LEVEL {
	l, ok := g.levelMap.Load(tag)
	if !ok {
		return 255
	}
	return l.(LEVEL)
}
func (g *Glg) TagStringToLevel(tag string) LEVEL {
	l, ok := g.levelMap.Load(tag)
	if !ok {
		return 255
	}
	return l.(LEVEL)
}
// TagStringToLevel converts level string to Glg.LEVEL