Features added
* Pythran can be used as a backend for evaluating NumPy array expressions.
* cdef classes now support pickling by default when possible.
This can be disabled with the ``auto_pickle`` directive.
* Speed up comparisons of strings if their hash value is available.
* Support pyximport from zip files.
* IPython magic now respects the ``__all__`` variable and ignores
names with leading-underscore (like ``import *`` does).
* ``abs()`` is optimised for C complex numbers.
* The display of C lines in Cython tracebacks can now be enabled at runtime
via ``import cython_runtime; cython_runtime.cline_in_traceback=True``.
The default has been changed to False.
* The overhead of calling fused types generic functions was reduced.
* "cdef extern" include files are now also searched relative to the current file.
* Optional optimization for re-aquiring the GIL, controlled by the
`fast_gil` directive.
Bugs fixed
----------
* Item lookup/assignment with a unicode character as index that is typed
(explicitly or implicitly) as ``Py_UCS4`` or ``Py_UNICODE`` used the
integer value instead of the Unicode string value. Code that relied on
the previous behaviour now triggers a warning that can be disabled by
applying an explicit cast. (Github issue 1602)
* f-string processing was adapted to changes in PEP 498 and CPython 3.6.
* Invalid C code when decoding from UTF-16(LE/BE) byte strings.
* Unicode escapes in 'ur' raw-unicode strings were not resolved in Py2 code.
* File paths of code objects are now relative.
* Decorators of cdef class methods could be executed twice.
* Several warnings in the generated coder are now suppressed.
Other changes
-------------
* The ``unraisable_tracebacks`` option now defaults to ``True``.
* Coercion of C++ containers to Python is no longer automatic on attribute
access (Github issue 1521).
* Access to Python attributes of cimported modules without the corresponding
import is now a compile-time (rather than runtime) error.
* Do not use special dll linkage for "cdef public" functions.
* cdef/cpdef methods must match their declarations. See Github Issue 1732.
This is now a warning and will be an error in future releases.
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