Cannot register custom editor descriptor for boolean

Description

We believe that this issue only occurs from CMS.UI 10 and forward because of changes made in CMS.Core 10.

Steps to reproduce:
1. On StandardPage.cs in Alloy templates, add this boolean property:

public virtual bool IsTrueOrNot { get; set; }

2. Add this EditorDescriptor:

    [EditorDescriptorRegistration(TargetType = typeof(bool))]
    public class BooleanEditorDescriptor : EditorDescriptor
    {
        public BooleanEditorDescriptor()
        {
            ClientEditingClass = "dijit/form/TextBox";
        }
    }

3. Create a page of type standardpage.
4. Go to all properties mode and edit the new property.

Expected
The IsTrueOrNot property is displayed as a textbox.

Actual
The property is still a regular checkbox

Note: Also, setting a matching UIHint on the boolean property does not work.

 [UIHint(BooleanEditorDescriptor.UIHint)]
 public virtual bool IsTrueOrNot { get; set; }
 
...
 
[EditorDescriptorRegistration(TargetType = typeof(bool), UIHint = UIHint)]
public class BooleanEditorDescriptor : EditorDescriptor
{ 
    public const string UIHint = "CustomBool";
    ... 
}