ttk.TreeView (and maybe other functions) is overzealous in converting item values to ints

GitHub fields:

assignee = None
closed_at = None
created_at = <Date 2018-08-21.04:49:03.443>
labels = ['3.8', '3.7', 'expert-tkinter']
title = 'ttk.TreeView (and maybe other functions) is overzealous in converting item values to ints'
updated_at = <Date 2018-08-21.05:53:15.100>
user = 'https://bugs.python.org/abarnert'

bugs.python.org fields:

activity = <Date 2018-08-21.05:53:15.100>
actor = 'serhiy.storchaka'
assignee = 'none'
closed = False
closed_date = None
closer = None
components = ['Tkinter']
creation = <Date 2018-08-21.04:49:03.443>
creator = 'abarnert'
dependencies = []
files = []
hgrepos = []
issue_num = 34447
keywords = []
message_count = 1.0
messages = ['323819']
nosy_count = 2.0
nosy_names = ['serhiy.storchaka', 'abarnert']
pr_nums = []
priority = 'normal'
resolution = None
stage = None
status = 'open'
superseder = None
type = None
url = 'https://bugs.python.org/issue34447'
versions = ['Python 3.6', 'Python 3.7', 'Python 3.8']