Generate fast XS accessors without runtime compilation
Class::XSAccessor implements fast read, write and read/write accessors in
XS. Additionally, it can provide predicates such as "has_foo()" for
testing whether the attribute "foo" is defined in the object. It only
works with objects that are implemented as ordinary hashes.
Class::XSAccessor::Array implements the same interface for objects that
use arrays for their internal representation.