Fix typo in unicode_decode_call_errorhandler_writer()

Bug introduced by changeset 7ed9993d53b4.
Fix bug in Unicode decoders related to _PyUnicodeWriter

Bug introduced by changesets 7ed9993d53b4 and edf029fc9591.
#17135: mark imp as deprecated as of 3.4.
Split PyUnicode_DecodeCharmap() into subfunction for readability
Partial revert of changeset 9744b2df134c

PyUnicode_Append() cannot call directly resize_compact(): I forgot that a
string can be ready *and* not compact (a legacy string can also be ready).
#17135: Add note in imp to use importlib for new programs.
Null merge.
Issue #17741: Add ElementTree.IncrementalParser, an event-driven parser for non-blocking applications.
fix typo in a comment