Proto constructor

const Proto({ int ownFieldsNumber = defaultOwnFieldsNumber, int superFieldsNumber = defaultSuperFieldsNumber, KnownSubClasses knownSubClassMap = noSubClass, })

Implementation

const Proto({
  this.ownFieldsNumber = defaultOwnFieldsNumber,
  this.superFieldsNumber = defaultSuperFieldsNumber,
  this.knownSubClassMap = noSubClass,
});