* Document Unicode string states
 * Use _PyUnicode_CheckConsistency() to ensure that objects are always
   consistent.

not a unicode, instead of failing with a fatal error.

Use assertions in debug mode (provide better error messages).

 * Rename _PyUnicode_Resize() to unicode_resize()
 * unicode_resize() creates a copy if the string cannot be resized instead
   of failing
 * Optimize resize_copy() for wstr strings
 * Disable temporary resize_inplace()

real-time signals.

 * Ensure that the input string is ready
 * Raise a ValueError instead of of a fatal error

PyUnicode_WriteChar() raises also a ValueError if the string has more than 1
reference.

unicode_getitem() reuses PyUnicode_ReadChar()

Patch by Dan Kenigsberg.

Issue #13034: When decoding some SSL certificates, the subjectAltName extension could be unreported.

Issue #13034: When decoding some SSL certificates, the subjectAltName extension could be unreported.

Rewrite unicode_subtype_new(): allocate directly the right type.

 * Rename existing _PyUnicode_UTF8() macro to PyUnicode_UTF8()
 * Rename existing _PyUnicode_UTF8_LENGTH() macro to PyUnicode_UTF8_LENGTH()
 * PyUnicode_UTF8() and PyUnicode_UTF8_LENGTH() are more strict

Issue #12804: Prevent "make test" from using network resources.

Fix also a bug: call PyUnicode_READY() before reading string length.