func isLineModeVar(mode lineMode) bool {
	if mode&lineModeValue > 0 {
		return true
	}
	if mode&lineModeMulti > 0 {
		return true
	}
	return false
}
isLineModeVar will return true if mode is variable, which is either
lineModeValue or lineModeMulti; otherwise it will return
false.
package ini
type lineMode uint
const (
	lineModeEmpty      lineMode = 0
	lineModeComment    lineMode = 1
	lineModeSection    lineMode = 2
	lineModeSubsection lineMode = 4
	lineModeValue      lineMode = 8
	lineModeMulti      lineMode = 16
)