Lambda the Ultimate

Using the well-known categorical notion of `functor' one may define the concept of datatype (algebra) without being forced to introduce a signature, that is, names and typings for the individual sorts (types) and operations involved. This has proved to be advantageous for those theory developments where one is not interested in the syntactic appearance of an algebra.

Does it sound like "a module without a signature"?

If you like programming with bananas, lenses, and other weird things you might like this paper as well.

PS: OTOH, if you are sceptic about bialgebraic programming, then dialgebraic is definitely not for you.