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 (2025-10-09 18:01:25 GIT hash 4826e516431c193e428991dd546a46472973d8d4 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