Improve JSON encoding with sort_keys=True

[pitrou]

BPO	10314
Nosy	@rhettinger, @pitrou
Files	jsonsort.patch

^{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 2010-11-04.16:51:56.319>
created_at = <Date 2010-11-04.16:31:37.158>
labels = ['library', 'performance']
title = 'Improve JSON encoding with sort_keys=True'
updated_at = <Date 2010-11-04.16:51:56.318>
user = 'https://github.com/pitrou'

bugs.python.org fields:

activity = <Date 2010-11-04.16:51:56.318>
actor = 'pitrou'
assignee = 'none'
closed = True
closed_date = <Date 2010-11-04.16:51:56.319>
closer = 'pitrou'
components = ['Library (Lib)']
creation = <Date 2010-11-04.16:31:37.158>
creator = 'pitrou'
dependencies = []
files = ['19496']
hgrepos = []
issue_num = 10314
keywords = ['patch']
message_count = 3.0
messages = ['120418', '120419', '120420']
nosy_count = 2.0
nosy_names = ['rhettinger', 'pitrou']
pr_nums = []
priority = 'normal'
resolution = 'fixed'
stage = None
status = 'closed'
superseder = None
type = 'performance'
url = 'https://bugs.python.org/issue10314'
versions = ['Python 3.2']

[pitrou]

This patch makes sorting of keys when encoding a dict into JSON faster by not calling pure Python code.

[rhettinger]

+1

[pitrou]

Ok, committed in r86169.