Does the JSON schema match ProtoJSON input or output?

[timostamm]

The example in the README includes:

// Product.Location.schema.json
{
  ...
  "properties": {
    "lat": {
      "anyOf": [
        {
          "type": "number"
        },
        {
          "type": "string"
        },
        {
          "enum": ["NaN", "Infinity", "-Infinity"],
          "type": "string"
        }
      ]
    },
...

The field is a Protobuf float. Parsers need to accept number, string, the special strings "NaN", "Infinity", "-Infinity", and also null. But implementations should only emit number and the special strings. (See ProtoJSON docs.)

The JSON schema allows number and the special strings, but also any other string. Does the schema aim to match what a conformant parser can parse, or what's emitted?