tarfile.itn breaks if n is a negative float

[shin]

BPO	32713
Nosy	@gustaebel, @miss-islington, @shin-
PRs	bpo-32713: Fix tarfile.itn for large/negative float values #5434 [3.7] bpo-32713: Fix tarfile.itn for large/negative float values. (GH-5434) #5917 [3.6] bpo-32713: Fix tarfile.itn for large/negative float values. (GH-5434) #5918

^{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 = None
closed_at = <Date 2018-04-01.08:00:45.835>
created_at = <Date 2018-01-29.21:15:56.876>
labels = ['type-bug', 'library']
title = 'tarfile.itn breaks if n is a negative float'
updated_at = <Date 2018-04-01.08:00:45.834>
user = 'https://github.com/shin'

bugs.python.org fields:

activity = <Date 2018-04-01.08:00:45.834>
actor = 'serhiy.storchaka'
assignee = 'none'
closed = True
closed_date = <Date 2018-04-01.08:00:45.835>
closer = 'serhiy.storchaka'
components = ['Library (Lib)']
creation = <Date 2018-01-29.21:15:56.876>
creator = 'j0ffrey'
dependencies = []
files = []
hgrepos = []
issue_num = 32713
keywords = ['patch']
message_count = 2.0
messages = ['311173', '312974']
nosy_count = 3.0
nosy_names = ['lars.gustaebel', 'miss-islington', 'j0ffrey']
pr_nums = ['5434', '5917', '5918']
priority = 'normal'
resolution = 'fixed'
stage = 'resolved'
status = 'closed'
superseder = None
type = 'behavior'
url = 'https://bugs.python.org/issue32713'
versions = ['Python 3.4', 'Python 3.5', 'Python 3.6']

[shin]

Originally reported @ github.com/docker/compose/issues/5618

It seems that tarfile.itn() attempts to execute bitwise operations on a float if the n argument is a negative float, raising a TypeError.

As pointed out in the original report, this is an issue when converting some mtime values in TarInfo._create_header

This also happens for positive floats > 8**11 - 1, but that one is less of an issue for the next two hundred years or so.

[miss-islington]

New changeset a9a8a98 by Miss Islington (bot) in branch '3.7':
bpo-32713: Fix tarfile.itn for large/negative float values. (GH-5434)
a9a8a98