FolderListModel 2.12: can't turn off caseSensitive property

FolderListModel (version 2.12, REVISION 12) works for me in all respects except that its caseSensitive property is always set to true and can't be turned off.  I don't see any coding error in folderlistmodel/qquickfolderlistmodel.{h,cpp} that would explain this problem.  The impact is that calls to its indexOf method can return -1 instead of the expected index of a case-insensitive file-URL match.

import Qt.labs.folderlistmodel 2.12;

FolderListModel {

  id: testModel;

  // This property doesn't seem to work as documented.

  caseSensitive: false;

  folder: "file:///path/to/folder";

  Component.onCompleted: {

    // Set a breakpoint here to watch the value *not* change.

    caseSensitive = false;

    caseSensitive = false;

    console.log(caseSensitive);  // logs "true"

{

{{}