Parent functions
Must Implement
__init__
has_coercion_from (cpdef)
gen
ngens
base_extend?
For Advanced Users
make_coercion_from (cpdef)
make_conversion_from (cpdef)
make_action_on (cpdef)
make_action_by (cpdef)
_populate_coercion_lists (cpdef)
Advanced Calls
get_coercion_from (cpdef)
get_conversion_from (cpdef)
get_action (cpdef)