feat: accept camelcase for config keys (#2651)

* feat: accept camelcase for config keys

* chore: refactor

* chore: refactor

* chore: add more tests

* chore: refactor

* fix: map elements of array

core/mapping/yamlunmarshaler_test.go

@@ -934,9 +934,8 @@ func TestUnmarshalYamlReaderError(t *testing.T) {
 	err := UnmarshalYamlReader(reader, &v)
 	assert.NotNil(t, err)
 
-	reader = strings.NewReader("chenquan")
-	err = UnmarshalYamlReader(reader, &v)
-	assert.ErrorIs(t, err, ErrUnsupportedType)
+	reader = strings.NewReader("foo")
+	assert.Error(t, UnmarshalYamlReader(reader, &v))
 }
 
 func TestUnmarshalYamlBadReader(t *testing.T) {
@@ -1012,6 +1011,13 @@ func TestUnmarshalYamlMapRune(t *testing.T) {
 	assert.Equal(t, rune(3), v.Machine["node3"])
 }
 
+func TestUnmarshalYamlBadInput(t *testing.T) {
+	var v struct {
+		Any string
+	}
+	assert.Error(t, UnmarshalYamlBytes([]byte("':foo"), &v))
+}
+
 type badReader struct{}
 
 func (b *badReader) Read(_ []byte) (n int, err error) {