[issue34363] dataclasses.asdict() mishandles dataclass instance attributes that are instances of subclassed typing.NamedTuple

[Alex DeLorenzo]

New submission from Alex DeLorenzo <alex.delorenzo at gmail.com>:

Example:

from typing import NamedTuple
from dataclasses import dataclass, asdict

class NamedTupleAttribute(NamedTuple):
    example: bool = True

@dataclass
class Data:
    attr1: bool
    attr2: NamedTupleAttribute

data = Data(True, NamedTupleAttribute(example=True))
namedtuple_attr = asdict(data)['attr2']
print(type(namedtuple_attr.example))
>>> generator

One would expect that the printed type would be of type bool.

----------
components: Interpreter Core
messages: 323298
nosy: alexdelorenzo
priority: normal
severity: normal
status: open
title: dataclasses.asdict() mishandles dataclass instance attributes that are instances of subclassed typing.NamedTuple
type: behavior
versions: Python 3.7

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue34363>
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