bind: Maintain backwards compatibility for map[string]interface{} binding

Author: thesaltree

bind.go

@@ -159,6 +159,12 @@ func (b *DefaultBinder) bindData(destination interface{}, data map[string][]stri
 		for k, v := range data {
 			if isElemString {
 				val.SetMapIndex(reflect.ValueOf(k), reflect.ValueOf(v[0]))
+			} else if isElemInterface {
+				if len(v) == 1 {
+					val.SetMapIndex(reflect.ValueOf(k), reflect.ValueOf(v[0]))
+				} else {
+					val.SetMapIndex(reflect.ValueOf(k), reflect.ValueOf(v))
+				}
 			} else {
 				val.SetMapIndex(reflect.ValueOf(k), reflect.ValueOf(v))
 			}

bind_test.go

@@ -498,7 +498,7 @@ func TestDefaultBinder_bindDataToMap(t *testing.T) {
 		assert.Equal(t,
 			map[string]interface{}{
 				"multiple": []string{"1", "2"},
-				"single":   []string{"3"},
+				"single":   "3",
 			},
 			dest,
 		)
@@ -510,7 +510,7 @@ func TestDefaultBinder_bindDataToMap(t *testing.T) {
 		assert.Equal(t,
 			map[string]interface{}{
 				"multiple": []string{"1", "2"},
-				"single":   []string{"3"},
+				"single":   "3",
 			},
 			dest,
 		)