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About the Py_UNICODE*data, int size APIs:
Ok, point taken.

In general, I think we ought to keep the callback feature as
open as possible, so passing in pointers and sizes would not
be very useful.

BTW, could you summarize how the callback works in a few
lines ?

About _Encode121: I'd name this _EncodeUCS1 since that's
what it is ;-)

About the new functions: I was referring to the new static
functions which you gave PyUnicode_... names. If these are
not supposed to turn into non-static functions, I'd rather
have them use lower case names (since that's how the Python
internals work too -- most of the times).