Version 2.1.0

• Improved performance
• Upgraded bundled msgpack headers to 3.2.0
• Merged PR #101: Update README in order to match compatibile PHP version
• Merged PR #125: fix ce->name is a zend_string
• Merged PR #106: Update README
• Merged PR #126: add mising tests in archive
• Merged PR #135: Add fixes for issue #81 This also includes tests.
• Merged PR #143: Fixed build with PHP-7.4
• Fixed issue #139: Segmentation fault when using cloned unpacker
• Fixed issue #132: Segfault on session php7.3
• Fixed issue #107: $unpacker->execute() bug
• Fixed issue #83: Arrays and negative index
• Fixed issue #137: DateTime(Immutable) serialization doesn't work with php 7.4 RC1
• Fixed issue #105: MessagePackUnpacker() bug
• Fixed issue #90: msgpack_unpack is super slow (30x times igbinary) on big data sets
• Fixed issue #91: Private property in base class
• Fixed issue #67: Integer overflow on a 64-bit system
• Fixed issue #33: int64 and uint64 decode is not supported in 32-bit php
• Fixed issue #119: uint64 numbers are cast to uint on Windows
• Fixed issue #134: msgpack-php msgpack_serialize/msgpack_pack not handling properly large int
• Fixed issue #81: Serialize optimization
• Fixed issue #108: tests/041.phpt failure
• Fixed issue #142: Recursion encoded as NULL
• Fixed issue #138: Serializers comparison for session like data