PyPy full changelog

Improve performance of u''.append
Prevent a crash in zlib when flushing a closed stream
Fix a few corner cases when encountering unicode values above 0x110000
Teach the JIT how to handle very large constant lists, sets, or dicts
Fix building on ARM32 (issue 2984)
Fix a bug in register assignment in ARM32
Package windows DLLs needed by cffi modules next to the cffi c-extensions (issue 2988)
Cleanup and refactor JIT code to remove rpython.jit.metainterp.typesystem
Fix memoryviews of ctype structures with padding, (cpython issue 32780)
CFFI updated to as-yet-unreleased 1.12.3

ssue2005: ignore errors on closing random file handles while importing a module (cpython compatibility)
issue2013: added constants to _ssl for TLS 1.1 and 1.2
issue2014: Add PyLong_FromUnicode to cpyext.
issue2017: On non-Linux-x86 platforms, reduced the memory impact of creating a lot of greenlets/tasklets. Particularly useful on Win32 and on ARM, where you used to get a MemoryError after only 2500-5000 greenlets (the 32-bit address space is exhausted).

The past months have seen pypy mature and grow, as rpython becomes the goto solution for writing fast dynamic language interpreters. Our separation of Rpython and the python interpreter PyPy is now much clearer in the PyPy documentation and we now have seperate RPython documentation. Tell us what still isn’t clear, or even better help us improve the documentation.
We merged version 2.7.9 of python’s stdlib. From the python release notice:
The entirety of Python 3.4’s ssl module has been backported. See PEP 466 for justification.
HTTPS certificate validation using the system’s certificate store is now enabled by default. See PEP 476 for details.

Bugfixes:
Many issues were cleaned up after being reported. Note that we consider performance slowdowns as bugs. Here is a summary of the user-facing changes; for more information see whats-new:
The ARM port no longer crashes on unaligned memory access to floats and doubles, and singlefloats are supported in the JIT.
Generators are faster since they now skip unnecessary cleanup
A first time contributor simplified JIT traces by adding integer bound propagation in indexing and logical operations.
Optimize consecutive dictionary lookups of the same key in a chain
Our extensive pre-translation test suite now runs nightly on more platforms
Fix issues with reimporting builtin modules
Fix an RPython bug with loop-unrolling that appeared in the HippyVM PHP port
Support for corner cases on objects with __int__ and __float__ methods
Fix multithreaded support for gethostbyname_ex and gethostbyaddr
Fix handling of tp_name for type objects

Bugfixes:
Many issues were cleaned up after being reported. Note that we consider performance slowdowns as bugs. Here is a summary of the user-facing changes; for more information see whats-new:
The ARM port no longer crashes on unaligned memory access to floats and doubles, and singlefloats are supported in the JIT.
Generators are faster since they now skip unnecessary cleanup
A first time contributor simplified JIT traces by adding integer bound propagation in indexing and logical operations.
Optimize consecutive dictionary lookups of the same key in a chain
Our extensive pre-translation test suite now runs nightly on more platforms
Fix issues with reimporting builtin modules
Fix an RPython bug with loop-unrolling that appeared in the HippyVM PHP port
Support for corner cases on objects with __int__ and __float__ methods
Fix multithreaded support for gethostbyname_ex and gethostbyaddr
Fix handling of tp_name for type objects

This is a bugfix release. The most important bugs fixed are:
an issue in sockets’ reference counting emulation, showing up notably when using the ssl module and calling makefile().
Tkinter support on Windows.
If sys.maxunicode==65535 (on Windows and maybe OS/X), the json decoder incorrectly decoded surrogate pairs.
some FreeBSD fixes.

This release targets version 2.7.3 of the Python language. This release main highlight is the introduction of the incremental garbage collector, sponsored by the Raspberry Pi Foundation.
This release also contains several bugfixes and performance improvements.

· JIT support for ARM, architecture versions 6 and 7, hard- and soft-float ABI
· Stacklet support for ARM
· Support for os.statvfs and os.fstatvfs on unix systems
· Improved logging performance
· Faster sets for objects
· Interpreter improvements
· During packaging, compile the CFFI based TK extension
· Pickling of numpy arrays and dtypes
· Subarrays for numpy
· Bugfixes to numpy
· Bugfixes to cffi and ctypes
· Bugfixes to the x86 stacklet support