dataclasses.asdict breaks with defaultdict fields

wrmsr

BPO	35540
Nosy	@ericvsmith, @ilevkivskyi, @pganssle, @wrmsr, @remilapeyre, @alexcoca, @ryx2, @kwsp
PRs	bpo-35540: Add collections.defaultdict support to dataclasses.{asdict,astuple} #11361 bpo-35540: Add collections.defaultdict support to dataclasses.{asdict,astuple} #11361 bpo-35540: Add collections.defaultdict support to dataclasses.{asdict,astuple} #11361 Proof of concept for a class registry in dataclasses.asdict #16356 bpo-35540 dataclasses.asdict support defaultdict fields #32056

^{Note: these values reflect the state of the issue at the time it was migrated and might not reflect the current state.}

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GitHub fields:

assignee = 'https://github.com/ericvsmith'
closed_at = None
created_at = <Date 2018-12-19.22:06:44.140>
labels = ['3.7', 'library']
title = 'dataclasses.asdict breaks with defaultdict fields'
updated_at = <Date 2022-03-22.18:28:58.077>
user = 'https://github.com/wrmsr'

bugs.python.org fields:

activity = <Date 2022-03-22.18:28:58.077>
actor = 'kwsp'
assignee = 'eric.smith'
closed = False
closed_date = None
closer = None
components = ['Library (Lib)']
creation = <Date 2018-12-19.22:06:44.140>
creator = 'wrmsr'
dependencies = []
files = []
hgrepos = []
issue_num = 35540
keywords = ['patch', 'patch', 'patch']
message_count = 6.0
messages = ['332166', '332741', '353092', '353116', '390850', '405243']
nosy_count = 8.0
nosy_names = ['eric.smith', 'levkivskyi', 'p-ganssle', 'wrmsr', 'remi.lapeyre', 'alexcoca', 'greenfish6', 'kwsp']
pr_nums = ['11361', '11361', '11361', '16356', '32056']
priority = 'normal'
resolution = None
stage = 'patch review'
status = 'open'
superseder = None
type = None
url = 'https://bugs.python.org/issue35540'
versions = ['Python 3.7']