When attempting to load the new LaunchAgent at `/System/Library/LaunchAgents/com.apple.cvmsCompAgent3600_arm64.plist` plistlib Raises a ValueError of 

  File "/opt/salt/lib/python3.7/plistlib.py", line 272, in handle_end_element
    handler()
  File "/opt/salt/lib/python3.7/plistlib.py", line 332, in end_integer
    self.add_object(int(self.get_data()))
ValueError: invalid literal for int() with base 10: '0x0100000c'

on

	<array>
		<integer>0x0100000c</integer>
	</array>

Technically this violates the spec at http://www.apple.com/DTDs/PropertyList-1.0.dtd. Figured it was worth reporting.

Full Plist is attached.

Please also report this at apple using the feedback assistent.

This file is still present on the latest version of macOS 11 beta on ARM64, with this integer value.  Furthermore plutil will happily read this file.

I'm in favour of changing plistlib to parse files like this.

Given this plist:

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE plist PUBLIC "-//Apple//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd">
<plist version="1.0">
<dict>
        <key>hex</key>
        <array>
                <integer>0x0100000c</integer>
        </array>
        <key>oct</key>
        <array>
                <integer>0123</integer>
        </array>
</dict>
</plist>


``plutil -convert json`` prints:

{"hex":[16777228],"oct":[123]}

That is, hexadecimal values are detected and parsed, but "0" as a prefix for octal values (as in C) is not.

New changeset 3185267400be853404f22a1e06bb9fe1210735c7 by Ronald Oussoren in branch 'master':
bpo-41491: plistlib: accept hexadecimal integer values in xml plist files (GH-22764)
https://github.com/python/cpython/commit/3185267400be853404f22a1e06bb9fe1210735c7

New changeset 3fc7080220b8dd2e1b067b3224879133d895ea80 by Miss Skeleton (bot) in branch '3.9':
bpo-41491: plistlib: accept hexadecimal integer values in xml plist files (GH-22764) (GH-22806)
https://github.com/python/cpython/commit/3fc7080220b8dd2e1b067b3224879133d895ea80

New changeset d1eb75585ef4c108732ec815cdc0adef087b1c3e by Miss Skeleton (bot) in branch '3.8':
bpo-41491: plistlib: accept hexadecimal integer values in xml plist files (GH-22764) (GH-22807)
https://github.com/python/cpython/commit/d1eb75585ef4c108732ec815cdc0adef087b1c3e

Does plutil support octal (0o) and binary (0b) literals?

It doesn't, both 0b101 and 0o101 get rejected as syntax errors.