All tests passed now. :) I think it's OK. Also upload the v10 version restore the statement to avoid the crash you mentioned in comments.

[1/1] test_zlib
test_abcdefghijklmnop (test.test_zlib.ChecksumTestCase)
test issue1202 compliance: signed crc32, adler32 in 2.x ... ok
test_adler32empty (test.test_zlib.ChecksumTestCase) ... ok
test_adler32start (test.test_zlib.ChecksumTestCase) ... ok
test_crc32empty (test.test_zlib.ChecksumTestCase) ... ok
test_crc32start (test.test_zlib.ChecksumTestCase) ... ok
test_negative_crc_iv_input (test.test_zlib.ChecksumTestCase) ... ok
test_penguins (test.test_zlib.ChecksumTestCase) ... ok
test_same_as_binascii_crc32 (test.test_zlib.ChecksumTestCase) ... ok
test_big_buffer (test.test_zlib.ChecksumBigBufferTestCase) ... ok
test_badcompressobj (test.test_zlib.ExceptionTestCase) ... ok
test_baddecompressobj (test.test_zlib.ExceptionTestCase) ... ok
test_badlevel (test.test_zlib.ExceptionTestCase) ... ok
test_decompressobj_badflush (test.test_zlib.ExceptionTestCase) ... ok
test_overflow (test.test_zlib.ExceptionTestCase) ... ok
test_64bit_compress (test.test_zlib.CompressTestCase) ... ok
test_big_compress_buffer (test.test_zlib.CompressTestCase) ... ok
test_big_decompress_buffer (test.test_zlib.CompressTestCase) ... ok
test_custom_bufsize (test.test_zlib.CompressTestCase) ... ok
test_incomplete_stream (test.test_zlib.CompressTestCase) ... ok
test_large_bufsize (test.test_zlib.CompressTestCase) ... ok
test_speech (test.test_zlib.CompressTestCase) ... ok
test_speech128 (test.test_zlib.CompressTestCase) ... ok
test_64bit_compress (test.test_zlib.CompressObjectTestCase) ... ok
test_badcompresscopy (test.test_zlib.CompressObjectTestCase) ... ok
test_baddecompresscopy (test.test_zlib.CompressObjectTestCase) ... ok
test_big_compress_buffer (test.test_zlib.CompressObjectTestCase) ... ok
test_big_decompress_buffer (test.test_zlib.CompressObjectTestCase) ... ok
test_clear_unconsumed_tail (test.test_zlib.CompressObjectTestCase) ... ok
test_compresscopy (test.test_zlib.CompressObjectTestCase) ... ok
test_compressincremental (test.test_zlib.CompressObjectTestCase) ... ok
test_compressoptions (test.test_zlib.CompressObjectTestCase) ... ok
test_compresspickle (test.test_zlib.CompressObjectTestCase) ... ok
test_decompimax (test.test_zlib.CompressObjectTestCase) ... ok
test_decompinc (test.test_zlib.CompressObjectTestCase) ... ok
test_decompincflush (test.test_zlib.CompressObjectTestCase) ... ok
test_decompress_incomplete_stream (test.test_zlib.CompressObjectTestCase) ... ok
test_decompress_unused_data (test.test_zlib.CompressObjectTestCase) ... ok
test_decompresscopy (test.test_zlib.CompressObjectTestCase) ... ok
test_decompressmaxlen (test.test_zlib.CompressObjectTestCase) ... ok
test_decompressmaxlenflush (test.test_zlib.CompressObjectTestCase) ... ok
test_decompresspickle (test.test_zlib.CompressObjectTestCase) ... ok
test_empty_flush (test.test_zlib.CompressObjectTestCase) ... ok
test_flush_custom_length (test.test_zlib.CompressObjectTestCase) ... ok
test_flush_large_length (test.test_zlib.CompressObjectTestCase) ... ok
test_flush_with_freed_input (test.test_zlib.CompressObjectTestCase) ... ok
test_flushes (test.test_zlib.CompressObjectTestCase) ... ok
test_large_unconsumed_tail (test.test_zlib.CompressObjectTestCase) ... ok
test_large_unused_data (test.test_zlib.CompressObjectTestCase) ... ok
test_maxlen_custom (test.test_zlib.CompressObjectTestCase) ... ok
test_maxlen_large (test.test_zlib.CompressObjectTestCase) ... ok
test_maxlenmisc (test.test_zlib.CompressObjectTestCase) ... ok
test_odd_flush (test.test_zlib.CompressObjectTestCase) ... ok
test_pair (test.test_zlib.CompressObjectTestCase) ... ok
test_wbits (test.test_zlib.CompressObjectTestCase) ... ok

----------------------------------------------------------------------
Ran 54 tests in 324.004s

OK
1 test OK.