Improve colorsys.rgb_to_hls code

[jjerphan]

BPO	42452
Nosy	@terryjreedy, @jjerphan
PRs	gh-86618: Improve colorsys.rgb_to_hls code #23306

^{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 2020-11-28.07:12:39.305>
created_at = <Date 2020-11-24.14:09:55.925>
labels = ['type-feature', 'library', '3.10']
title = 'Improve colorsys.rgb_to_hls code'
updated_at = <Date 2020-11-28.07:12:39.304>
user = 'https://github.com/jjerphan'

bugs.python.org fields:

activity = <Date 2020-11-28.07:12:39.304>
actor = 'terry.reedy'
assignee = 'none'
closed = True
closed_date = <Date 2020-11-28.07:12:39.305>
closer = 'terry.reedy'
components = ['Library (Lib)']
creation = <Date 2020-11-24.14:09:55.925>
creator = 'jjerphan'
dependencies = []
files = []
hgrepos = []
issue_num = 42452
keywords = []
message_count = 3.0
messages = ['381748', '381981', '381982']
nosy_count = 2.0
nosy_names = ['terry.reedy', 'jjerphan']
pr_nums = ['23306']
priority = 'normal'
resolution = 'fixed'
stage = 'resolved'
status = 'closed'
superseder = None
type = 'enhancement'
url = 'https://bugs.python.org/issue42452'
versions = ['Python 3.10']

[jjerphan]

This issue has been created after the PR.

[terryjreedy]

New changeset f919531 by Julien Jerphanion in branch 'master':
bpo-42452: Improve colorsys.rgb_to_hls code (GH-23306)
f919531

[terryjreedy]

The change was a suggested TODO in the code itself.