plistlib: improve bytes handling

[sobolevn]

dumps

>>> import plistlib
>>> plistlib.dumps(bytearray())
b'<?xml version="1.0" encoding="UTF-8"?>\n<!DOCTYPE plist PUBLIC "-//Apple//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd">\n<plist version="1.0">\n<data>\n</data>\n</plist>\n'
>>> plistlib.dumps(memoryview(b''))
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
  File "/Users/sobolev/.pyenv/versions/3.10.0/lib/python3.10/plistlib.py", line 901, in dumps
    dump(value, fp, fmt=fmt, skipkeys=skipkeys, sort_keys=sort_keys)
  File "/Users/sobolev/.pyenv/versions/3.10.0/lib/python3.10/plistlib.py", line 894, in dump
    writer.write(value)
  File "/Users/sobolev/.pyenv/versions/3.10.0/lib/python3.10/plistlib.py", line 325, in write
    self.write_value(value)
  File "/Users/sobolev/.pyenv/versions/3.10.0/lib/python3.10/plistlib.py", line 360, in write_value
    raise TypeError("unsupported type: %s" % type(value))
TypeError: unsupported type: <class 'memoryview'>

loads

>>> plistlib.loads(b'<?xml version="1.0" encoding="UTF-8"?>\n<!DOCTYPE plist PUBLIC "-//Apple//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd">\n<plist version="1.0">\n<integer>123</integer>\n</plist>\n')
123
>>> plistlib.loads(bytearray(b'<?xml version="1.0" encoding="UTF-8"?>\n<!DOCTYPE plist PUBLIC "-//Apple//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd">\n<plist version="1.0">\n<integer>123</integer>\n</plist>\n'))
123
>>> plistlib.loads(memoryview(b'<?xml version="1.0" encoding="UTF-8"?>\n<!DOCTYPE plist PUBLIC "-//Apple//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd">\n<plist version="1.0">\n<integer>123</integer>\n</plist>\n'))
123

readPlistFromBytes

It is using the same logic loads does: https://github.com/python/cpython/blob/948c6794711458fd148a3fa62296cadeeb2ed631/Lib/plistlib.py#L115-L123

[github-actions]

According to mypy_primer, this change has no effect on the checked open source code. 🤖🎉