StopIteration with value. More safely handle non-normalized exceptions
in -_PyGen_FetchStopIterationValue.

This matches the documentation, and passes the test suite when multithreading
is disabled.

Patch by Anish Tambe.

when called from coroutines or callbacks.

Run expensive type checks only in debug mode.  In addition, stop
supporting passing handles to loop.run_in_executor.

the garbage collector is invoked in other thread.
Based on patch by Sebastian Cufre.

Original patch by Mariatta Wijaya.

given empty data twice.  Patch by Benjamin Fogle.

file with compression before trying to open it without compression.  Otherwise
it had 50% chance failed with ignore_zeros=True.

object.__format__ now contains the name of actual type.

browsers.  Based on patch by Oleg Broytman.

by representing the scale as float value internally in Tk.  tkinter.IntVar
now works if float value is set to underlying Tk variable.

* Cannot seem to link directly to main options from the “unittest” module,
  because that module has its own set of options
* Mask out linking for options that no longer exist in Python 3

special input values as literal text.

PyUnicode_AsEncodedObject() in _curese to ensure that the result
is a bytes object.

Patch by Tim Mitchell.

subclasses of accelerated OrderedDict.