duration.go
func (d Duration) MarshalJSON() ([]byte, error) {
	var w jwriter.Writer
	d.MarshalEasyJSON(&w)
	return w.BuildBytes()
}
func (d Duration) MarshalJSON() ([]byte, error) {
	var w jwriter.Writer
	d.MarshalEasyJSON(&w)
	return w.BuildBytes()
}
// MarshalJSON returns the Duration as JSON