"One of" is incorrectly translated to merged object schema in JSON Schema and loses required field information

[rdgreen]

An array[NodeData], where NodeDate is defined as:

## NoteData (fixed-type)
+ One of
    + Properties
        + id: 1 (required, number) - Unique identifier
        + title: Grocery list (required) - Single line description
        + body: Buy milk - Full description of the note which supports Markdown.
    + Properties
        + id: 1 (required, number) - Unique identifier
        + title: Grocery list (required) - Single line description
        + body: Buy milk - Full description of the note which supports Markdown.
        + other: Other stuff (required)

produces, in the JSON schema:

{
  "type": "array",
  "items": {
    "type": "object",
    "properties": {
      "id": {
        "type": "number",
        "description": "Unique identifier"
      },
      "title": {
        "type": "string",
        "description": "Single line description"
      },
      "body": {
        "type": "string",
        "description": "Full description of the note which supports Markdown."
      },
      "other": {
        "type": "string"
      }
    },
    "allOf": [
      {
        "not": {
          "required": [
            "id",
            "title",
            "body",
            "id",
            "title",
            "body",
            "other"
          ]
        }
      }
    ]
  },
  "$schema": "http://json-schema.org/draft-04/schema#"
}