is(upper/lower/title) are not exactly correct

[benjaminp]

BPO	13822
Nosy	@giampaolo, @benjaminp, @ezio-melotti, @tirkarthi

^{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 = None
created_at = <Date 2012-01-19.04:22:54.269>
labels = ['type-feature', 'expert-unicode']
title = 'is(upper/lower/title) are not exactly correct'
updated_at = <Date 2018-09-22.16:28:32.920>
user = 'https://github.com/benjaminp'

bugs.python.org fields:

activity = <Date 2018-09-22.16:28:32.920>
actor = 'xtreak'
assignee = 'none'
closed = False
closed_date = None
closer = None
components = ['Unicode']
creation = <Date 2012-01-19.04:22:54.269>
creator = 'benjamin.peterson'
dependencies = []
files = []
hgrepos = []
issue_num = 13822
keywords = []
message_count = 1.0
messages = ['151606']
nosy_count = 4.0
nosy_names = ['giampaolo.rodola', 'benjamin.peterson', 'ezio.melotti', 'xtreak']
pr_nums = []
priority = 'normal'
resolution = None
stage = 'needs patch'
status = 'open'
superseder = None
type = 'enhancement'
url = 'https://bugs.python.org/issue13822'
versions = ['Python 3.5']

[benjaminp]

The isupper() and islower() methods currently use the Lowercase and Uppercase derived properties. Technically, they should use the Changes_When_(Lowercased/Uppercased/Titlecased) and Changes_When_Casemapped derived properties to compute their results.