Status: OUT
A complete, verifiable behavioral specification of a type is achievable by combining LSP's three-layer contract (signature compatibility, behavioral constraints, history constraint) with protocol-level sequencing constraints for valid operation orderings, unless behavioral subtyping's fundamental undecidability limits verification to incomplete approximations.
LSP contracts plus protocol sequences yield a theoretically complete specification, gated by the undecidability of full behavioral verification
Depends on (SL): lsp-contractual-completeness, protocol-extends-interface-with-sequences