Unicode string.

This is an incompatible change, but the previous behaviour was completly wrong.

#670664: Fix HTMLParser to correctly handle the content of ``<script>...</script>`` and ``<style>...</style>``.

PYTHONNOUSERSITE).  (Patch by Carl Meyer)

even when reporthook is None. Patch by Jyrki Pulliainen.

(Patch by Roger Serwy)

Issue 13274:  Make the pure python code for heapq more closely match the C implementation for an undefined corner case.