Support of dict types

[vvmruder]

I encounter a limit Iam curious why it is there.

Assuming the following code:

from dataclasses import dataclass, field
from xsdata.formats.dataclass.parsers import DictDecoder
test_dict = {
    "dict_type": {
        "a": {
            "name": "namea",
            "value": 1
        },
        "b": {
            "name": "nameb",
            "value": 2
        },
        "c": {
            "name": "namec",
            "value": 3
        }
    }
}


@dataclass
class TestMember:
    name: str = field(
        metadata={
            "type": "Element",
            "required": True
        }
    )
    value: int = field(
        metadata={
            "type": "Element",
            "required": True
        }
    )


@dataclass
class Test:
    dict_type: dict[TestMember]


DictDecoder().decode(test_dict, Test)

It will end up with:

xsdata.exceptions.XmlContextError: Error on Test::dict_type: Xml Text does not support typing `dict[__main__.TestMember]`

May I ask, what are the limitations here or for a hint what I did wrong?