Dynamic types in fact provide something which qualifies as a guarantee. If properly implemented, they prevent an incorrectly typed operation from being applied to a value, which would otherwise result in nonportable, unpredictable or fatal consequences, possibly without any diagnostic. Dynamic types, in an of themselves, do this at the last possible moment. Dynamic typing doesn&#x27;t preclude the application of static checking with type inference and&#x2F;or optional declarations, however.