declare namespace Entity {
  interface Options<PEMC extends Entity.Meta.Config = Entity.Meta.Config> {
    /**
     * Additional single-value records that can be stored alongside this entity
     */
    meta_fields?: PEMC

    /**
     * Used to process with all provided `key` values to ensure they follow the correct syntax.
     */
    key_validator?: KeyValidator
   
    /**
     * Used to process with all provided `key` values to ensure they follow the correct syntax.
     */
    key_formatter?: KeyFormatter
  }
}