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Antoine, I have explained the reasons for rejecting the patch. In short,
it violates a design principle behind the Unicode implementation.
If you want to change such a basic aspect of the Unicode implementation,
then write a PEP which demonstrates the usefulness on a larger set of
more general tests and comes up with significant results (10% speedup in
some micro benchmarks is not significant; memory tests need to be run
without pymalloc and require extra care to work around OS malloc
optimization strategies).
Like I said: The current design of the Unicode object implementation
would benefit more from advances in pymalloc tuning, not from making it
next to impossible to extend the Unicode objects to e.g. 
 * reuse existing memory blocks for allocation, 
 * pointing straight into memory mapped files, 
 * providing highly efficient ways to tokenize Unicode data,
 * sharing of data between Unicode objects,
 etc.
The reason I chose this design was to make the above easily
implementable and it was a conscious decision to use a PyObject
rather than a PyVarObject, like the string object, since I knew 
that the Unicode object was eventually going to replace the string
object.