Serialize array.array to JSON by default

[thedrow]

BPO	26263
Nosy	@rhettinger, @pitrou, @ezio-melotti, @thedrow, @AnishShah

^{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 2016-02-01.18:50:39.869>
labels = ['extension-modules', 'type-feature']
title = 'Serialize array.array to JSON by default'
updated_at = <Date 2016-03-08.18:59:11.299>
user = 'https://github.com/thedrow'

bugs.python.org fields:

activity = <Date 2016-03-08.18:59:11.299>
actor = 'shakur shams Mullick'
assignee = 'none'
closed = False
closed_date = None
closer = None
components = ['Extension Modules']
creation = <Date 2016-02-01.18:50:39.869>
creator = 'Omer.Katz'
dependencies = []
files = []
hgrepos = []
issue_num = 26263
keywords = []
message_count = 1.0
messages = ['259341']
nosy_count = 6.0
nosy_names = ['rhettinger', 'pitrou', 'ezio.melotti', 'Omer.Katz', 'anish.shah', 'shakur shams Mullick']
pr_nums = []
priority = 'normal'
resolution = None
stage = None
status = 'open'
superseder = None
type = 'enhancement'
url = 'https://bugs.python.org/issue26263'
versions = ['Python 3.6']

[thedrow]

Is there a reason why the JSON module doesn't serialize array.array() instances by default?
Currently you need to convert them to tuples but I'm confident that the C API for those types is enough to iterate over the array and serialize it to a JSON list.
We should support serializing arrays by default in my opinion.