properties and additionalProperties

[sbrunner]

When we have properties and additionalProperties like:

{
  "propterites": {
    "id": {"type": "number"}
  },
  "additionalProperties": {"type": "string"}
}

It is interpreted as:

TypeTyped = TypedDict(
    "TypeTyped",
    {
        "type": Union[int, float]
    },
    totaf=False,
)

Type = Union[TypeTyped, Dict[str, str]]

But it's not entirely correct.

See also: python/mypy#6131

[Andrew-Chen-Wang]

There are two options here:

• Per recommendation by GvR, we could use dataclasses but that would break quite a bit of things
• The other way is to subclass dataclasses or NamedTuple that defines __getattr__ so that one can do var[field].