Properly ppropagate directives for type conversion code.
Properly ppropagate directives for type conversion code.

This fixes #1790.

scoder/cython,scoder/cython,scoder/cython,cython/cython,cython/cython,cython/cython,da-woods/cython,da-woods/cython,da-woods/cython,scoder/cython,da-woods/cython,cython/cython