Library json, file json/encoder.py: Function floatstr should be a class-level function.

GitHub fields:

assignee = None
closed_at = None
created_at = <Date 2020-11-22.11:15:21.561>
labels = ['3.7', '3.8', '3.9', '3.10', 'type-feature', 'library']
title = 'Library json, file json/encoder.py: Function floatstr should be a class-level function.'
updated_at = <Date 2020-11-22.11:20:47.761>
user = 'https://bugs.python.org/salacdav'

bugs.python.org fields:

activity = <Date 2020-11-22.11:20:47.761>
actor = 'python-dev'
assignee = 'none'
closed = False
closed_date = None
closer = None
components = ['Library (Lib)']
creation = <Date 2020-11-22.11:15:21.561>
creator = 'salacdav'
dependencies = []
files = ['49613']
hgrepos = []
issue_num = 42434
keywords = ['patch']
message_count = 1.0
messages = ['381609']
nosy_count = 2.0
nosy_names = ['python-dev', 'salacdav']
pr_nums = ['23459']
priority = 'normal'
resolution = None
stage = 'patch review'
status = 'open'
superseder = None
type = 'enhancement'
url = 'https://bugs.python.org/issue42434'
versions = ['Python 3.6', 'Python 3.7', 'Python 3.8', 'Python 3.9', 'Python 3.10']