Unfortunately due to optimised build of Python3 libraries and executable I got only partial stack from [http://clang.llvm.org/docs/AddressSanitizer.html], however digging into and reducing my code I tracked it down to be issue with `boost/libs/python/src/object/enum.cpp`.

It has to bits that leak (and comment mentioning there is one):

    PyObject *mod = PyObject_GetAttrString( self_, "__module__");

Leaks reference, as it never decreases it.
It also stores a new string object under object's `name` that ref count never gets decremented.

That commit fixes both issues.

…get_signature when multiple calling conventions are enabled"

This reverts commit b49a186.