I pushed release 0.9.2 out of the door with mostly just this fix:
https://bitbucket.org/cffi/cffi/issue/187/inconsistencies-in-ffifrom_buffer
ffi.from_buffer() was incorrectly accepting objects of type
'memoryview' containing strings, which was not intended --- it works
only on CPython, not PyPy, and it is documented that it should not
work. Additionally, still on CPython, ffi.from_buffer() was
incorrectly rejecting objects of type 'buffer' pointing to read-only
objects, say read-only numpy arrays. (Insert here the usual rant
against the internal mess of buffer and memoryview objects.)
23dee1c4ef