fix allow zero in get func and adding test for checking that

retrieve.go

@@ -9,7 +9,7 @@ import (
 func Get(out interface{}, path string, opts ...option) interface{} {
 	options := newOptions(opts...)
 
-	result := get(reflect.ValueOf(out), path)
+	result := get(reflect.ValueOf(out), path, opts...)
 	// valid kind and we can return a result.Interface() without panic
 	if result.Kind() != reflect.Invalid && result.CanInterface() {
 		// if we don't allow zero and the result is a zero value return nil

retrieve_test.go

@@ -67,6 +67,21 @@ func TestGetThroughInterface(t *testing.T) {
 	is.Equal(Get(foo, "BarPointer.Bars.Bar.Name"), []string{"Level2-1", "Level2-2"})
 }
 
+func TestGetWithAllowZero(t *testing.T) {
+	is := assert.New(t)
+
+	var test []struct {
+		Age int
+	}
+
+	for i := 0; i < 10; i++ {
+		test = append(test, struct{ Age int }{Age: i})
+	}
+
+	is.Equal(Get(test, "Age").([]int), []int{1, 2, 3, 4, 5, 6, 7, 8, 9})
+	is.Equal(Get(test, "Age", WithAllowZero()).([]int), []int{0, 1, 2, 3, 4, 5, 6, 7, 8, 9})
+}
+
 func TestGetNotFound(t *testing.T) {
 	is := assert.New(t)