fixed bug where zero values for bools and ints would falsely error.

config.go

@@ -228,6 +228,9 @@ func convertAndSetSlice(slicePtr interface{}, values []string) []int {
 // False is used to prevent accidental logging of secrets as
 // as the strconv include s in their error message.
 func convertAndSetValue(settable interface{}, s string) bool {
+	if s == "" {
+		return true
+	}
 	settableValue := reflect.ValueOf(settable).Elem()
 	var (
 		err error

config_test.go

@@ -44,6 +44,7 @@ func Test_Integration(t *testing.T) {
 		"C=4 5 6",
 		"DoG__E=true",
 		"DoG__FErDINANd=true",
+		// should NOT log doc_j as it is not provided
 		"G=1 y 2", // should log G[1] as it is an incorrect type, but still work with 0 and 2
 		"H=-84",   // should log H as it is an incorrect type
 		"I=",      // should NOT log I as there is no way to tell if it is missing or deliberately empty
@@ -54,7 +55,11 @@ func Test_Integration(t *testing.T) {
 	}
 	err = os.Setenv("B", "overridden")
 	if err != nil {
-		t.Fatalf("failed to override environ: %v", err)
+		t.Fatalf("failed to set environ: %v", err)
+	}
+	err = os.Setenv("C", "") // this should NOT override as it is empty
+	if err != nil {
+		t.Fatalf("failed to set environ: %v", err)
 	}
 
 	var got testConfig
@@ -71,12 +76,12 @@ func Test_Integration(t *testing.T) {
 		H: 0,
 		I: "",
 	}
-	wantFailedFields := []string{"file[" + nonExistFile.Name() + "]", "dog__j", "g[1]", "h"}
+	wantFailedFields := []string{"file[" + nonExistFile.Name() + "]", "g[1]", "h"}
 
 	builder := From(file.Name()).From(nonExistFile.Name()).FromEnv()
 	gotErr := builder.To(&got)
 	if !reflect.DeepEqual(got, want) {
-		t.Errorf("Integration: got %+v, wantPanic %+v", got, want)
+		t.Errorf("Integration: got %+v, want %+v", got, want)
 	}
 	if gotErr == nil {
 		t.Errorf("Integration: should have had an error")

example_test.go

@@ -53,7 +53,7 @@ func Example_errorHandling() {
 	fmt.Println(err)
 
 	// Output:
-	// config: the following fields had errors: [port feature_flag]
+	// config: the following fields had errors: [port]
 }
 
 func Example_fromFileWithOverride() {