=== POSITIVE ===
// This value can be a bool or a string with the value "true" or "false".
{
  "anyOf": [
    {
      "type": "boolean"
    },
    {
      "enum": ["true", "false"],
      "type": "string"
    }
  ]
}
=== NEGATIVE ===
{
  "anyOf": []
}
=== NEGATIVE ===
{
  "anyOf": null
}
=== NEGATIVE ===
{
  "anyOf": false
}
=== NEGATIVE ===
{
  "anyOf": "foo"
}
=== NEGATIVE ===
{
  "anyOf": 1
}
=== NEGATIVE ===
{
  "anyOf": -1
}
=== NEGATIVE ===
{
  "anyOf": 1.2
}
=== NEGATIVE ===
{
  "anyOf": {}
}
