* ```
   */
  fun withTag(
    tagClass: Int = DerHeader.TAG_CLASS_CONTEXT_SPECIFIC,
    tag: Long,
  ): BasicDerAdapter<T> = copy(tagClass = tagClass, tag = tag)

  /** Returns a copy of this adapter that doesn't encode values equal to [defaultValue]. */
  fun optional(defaultValue: T? = null): BasicDerAdapter<T> = copy(isOptional = true, defaultValue = defaultValue)

  /**