using afIoc::NotFoundErr** Contribute to set factory default '@Config' values. Only BedSheet and 3rd Party libraries should ** set / contribute factory defaults. Web applications should override factory defaults by ** contributing to `ApplicationDefaults`. ** ** @uses a MappedConfig of 'Str:Obj' of IDs to Objs. Obj values must be immutable.constmixin FactoryDefaults { @NoDocabstract Str:Obj? config()}internalconstclass FactoryDefaultsImpl : FactoryDefaults {overrideconst Str:Obj? confignew make(Str:Obj? config){this.config = config.toImmutable}}