Decoding a `generic` class hierarchy

[nrbnlulu]

Question

Hi, thanks for the great library!

Assuming this class hierarchy

import msgspec
from msgspec import Struct


class SystemsStatus[T: msgspec.Struct](Struct, tag=True): ...


class SystemsStatusInitial[T: msgspec.Struct](SystemsStatus[T]):
	nodes: list[T]


class SystemsRemoved[T: msgspec.Struct](SystemsStatus[T]):
	ids: list[int]


class SystemsUpdated[T: msgspec.Struct](SystemsStatus[T]):
	nodes: list[T]


def get_union[T: msgspec.Struct](t: type[T]) -> type[SystemsStatus[T]]:
	return SystemsRemoved[t] | SystemsStatusInitial[t] | SystemsUpdated[t]

DECODER = msgspec.json.Decoder(get_union(SomeDTO))

Is this the prefered way to create a decoder or I can do something like this

DECODER =  msgspec.json.Decoder(SystemsStatus[SomeDTO]) 

Which failed decoding one of the inherited classes data.