Status: IN
Visitor's complete recursive computation mechanism (dual hierarchy for structural independence plus double dispatch for type governance) provides independent validation of the GoF's compositional monism: even the most sophisticated behavioral capability in the catalog — governed stateful computation across heterogeneous recursive structures — is achieved entirely through composition, not inheritance.
Visitor's composition-based computation validates that compositional monism extends to the most complex behavioral mechanisms
Depends on (SL): visitor-complete-recursive-computation-mechanism, behavioral-infrastructure-compositionally-unified