appengine.go
func (g GeoPoint) Valid() bool {
	return -90 <= g.Lat && g.Lat <= 90 && -180 <= g.Lng && g.Lng <= 180
}
func (g GeoPoint) Valid() bool {
	return -90 <= g.Lat && g.Lat <= 90 && -180 <= g.Lng && g.Lng <= 180
}
// Valid returns whether a GeoPoint is within [-90, 90] latitude and [-180, 180] longitude.