Reported and diagnosed by Thomas Kluyver.

Reported and diagnosed by Thomas Kluyver.

if the underlying raw stream is unseekable, even if the seek could be
satisfied using the internal buffer.  Patch by John OConnor.

if the underlying raw stream is unseekable, even if the seek could be
satisfied using the internal buffer.  Patch by John O'Connor.

memory watchdog for timely stats collection.

- bigmemtest is replaced by precisionbigmemtest
- add a poor man's watchdog thread to print memory consumption

- bigmemtest is replaced by precisionbigmemtest
- add a poor man's watchdog thread to print memory consumption

metaclass is registered with copyreg.  Patch by Nicolas M. Thiéry and
Craig Citro.

metaclass is registered with copyreg.  Patch by Nicolas M. Thiéry and
Craig Citro.

Ensure these states with assertions in _PyUnicode_CheckConsistency().

Cleanup also the code.

state

Add also related assertions to _PyUnicode_CheckConsistency().

PyUnicode_CopyCharacters() may copies less character than requested size, if
the input string is smaller than the argument. (This is very unlikely, but who
knows!?)

Avoid also calling PyUnicode_CopyCharacters() if the string is empty.

Don't check PyUnicode_CopyCharacters() in release mode. Rename also some
variables.