whitespace, not only spaces.  Patch by Robert Xiao.

object.__format__ now contains the name of actual type.

Initially (e0b7e34b5971) it should be \udef0, but after 52a77ef069cd
(issue #3672) lone surrogates are not accepted and should be removed.

Patch by Xiang Zhang.

- Issue #25958: Support "anti-registration" of special methods from
  various ABCs, like __hash__, __iter__ or __len__.  All these (and
  several more) can be set to None in an implementation class and the
  behavior will be as if the method is not defined at all.
  (Previously, this mechanism existed only for __hash__, to make
  mutable classes unhashable.)  Code contributed by Andrew Barnert and
  Ivan Levkivskyi.

bytearray for integers in and out of the Py_ssize_t range.
Patch by Xiang Zhang.

negative integer for resized bytearray.

now return an instance of corresponding subclass.

Patch by Joe Jevnik.

Return a bytearray object when bytearray is requested and when the small buffer
is used.

Fix also test_bytes: bytearray%args must return a bytearray type.

This eliminates a few redundant test cases.

ByteArrayAsStringTest.fixtype() was converting test data to bytes, not byte-
array, therefore many of the test cases inherited in this class were not
actually being run on the bytearray type.

The tests in buffer_tests.py were redundant with methods in string_tests
.MixinStrUnicodeUserStringTest and string_tests.CommonTest. These methods are
now moved into string_tests.BaseTest, where they will also get run for bytes
and bytearray.

This change also moves test_additional_split(), test_additional_rsplit(), and
test_strip() from CommonTest to BaseTest, meaning these tests are now run for
bytes and bytearray. I plan to eliminate redundancies with existing tests in
test_bytes.py soon.

Affected classes are generic sequence iterators, iterators of str, bytes,
bytearray, list, tuple, set, frozenset, dict, OrderedDict, corresponding
views and os.scandir() iterator.

* test_contains() did not override anything
* test_expandtabs/upper/lower() in FixedStringTest were masking usable tests
  in string_tests. These tests now get run for bytearray() and bytes().
* test_expandtabs/upper/lower() in buffer_tests were only run on bytearray()
  and are redundant with string_tests

__bytes__, __trunc__, and __float__ returning instances of subclasses of
bytes, int, and float to subclasses of bytes, int, and float correspondingly.

Issue #25401: Optimize bytes.fromhex() and bytearray.fromhex(): they are now
between 2x and 3.5x faster. Changes:

* Use a fast-path working on a char* string for ASCII string
* Use a slow-path for non-ASCII string
* Replace slow hex_digit_to_int() function with a O(1) lookup in
  _PyLong_DigitValue precomputed table
* Use _PyBytesWriter API to handle the buffer
* Add unit tests to check the error position in error messages

On Windows, sprintf("%p", 0xabcdef) formats hexadecimal in uppercase and pad to
16 characters (on 64-bit system) with zeros.

* Add much more unit tests on PyBytes_FromFormatV()
* Remove the first loop to compute the length of the output string
* Use _PyBytesWriter to handle the bytes buffer, use overallocation
* Cleanup the code to make simpler and easier to review

object now always allocates place for trailing null byte and it's buffer now
is always null-terminated.

Issue #23985: Fix a possible buffer overrun when deleting a slice from the front of a bytearray and then appending some other bytes data.

Patch by Martin Panter.

Also updates a few internal implementations of the same thing to use the
new built-in code.

Contributed by Arnon Yaari.

and array_buffer_getbuf().

is specified with non-string argument.  Based on patch by Renaud Blanch.

Issue #22335: Fix crash when trying to enlarge a bytearray to 0x7fffffff bytes on a 32-bit platform.

Patch by Yongzhi Pan.