Functions for creating handles to native functions and loading native libraries.

Functions for adjusting the layout of structs.

Functions for managing native allocations, memory arenas, and (de)serialization.

For any new type to be implemented, three multimethods must be overriden, but
which three depends on the native representation of the type.

If the native representation of the type is a primitive (whether or not other
data beyond the primitive is associated with it, as e.g. a pointer),
then [[primitive-type]] must be overriden to return which primitive type it is
serialized as, then [[serialize*]] and [[deserialize*]] should be overriden.

If the native representation of the type is a composite type, like a union,
struct, or array, then [[c-layout]] must be overriden to return the native
layout of the type, and [[serialize-into]] and [[deserialize-from]] should be
overriden to allow marshaling values of the type into and out of memory
segments.