convenience version of `type.default` for effect values whose type is exactly the effect type (i.e., the value type does not inherit from the effect type).
set default instance for effect type `effect.this` to value `effect.this`.
NYI: UNDER DEVELOPMENT: See type.default
0.095dev (2025-09-09 14:29:31 GIT hash 98644f8f651c2101a0730cfe31c5807993b7603b built by fridi@fzen)
exactly the effect type (i.e., the value type does not inherit
from the effect type).
set default instance for effect type `effect.this` to value `effect.this`.
NYI: UNDER DEVELOPMENT: See type.default