<img src="https://fastapi.tiangolo.com/img/async/concurrent-burgers/concurrent-burgers-02.png" alt="illustration">

El cajero 💁 le dice algo al chico de la cocina 👨‍🍳 para que sepa que tiene que preparar tus hamburguesas 🍔 (a pesar de que actualmente está preparando las de los clientes anteriores).

<img src="https://fastapi.tiangolo.com/img/async/concurrent-burgers/concurrent-burgers-03.png" alt="illustration">

Pagas 💸.

	b.lastRuneSize = size
	return r, size, nil
}

// UnreadRune unreads the last rune. If the most recent method called on
// the [Reader] was not a [Reader.ReadRune], [Reader.UnreadRune] returns an error. (In this
// regard it is stricter than [Reader.UnreadByte], which will unread the last byte
// from any read operation.)
func (b *Reader) UnreadRune() error {
	if b.lastRuneSize < 0 || b.r < b.lastRuneSize {
		return ErrInvalidUnreadRune

}

// UnreadRune unreads the last rune returned by [Buffer.ReadRune].
// If the most recent read or write operation on the buffer was
// not a successful [Buffer.ReadRune], UnreadRune returns an error.  (In this regard
// it is stricter than [Buffer.UnreadByte], which will unread the last byte
// from any read operation.)
func (b *Buffer) UnreadRune() error {
	if b.lastRead <= opInvalid {

   *     lower-case characters
   */
  public abstract BaseEncoding lowerCase();

  /**
   * Returns an encoding that behaves equivalently to this encoding, but decodes letters without
   * regard to case.
   *
   * @throws IllegalStateException if the alphabet used by this encoding contains mixed upper- and
   *     lower-case characters
   * @since 32.0.0
   */
  public abstract BaseEncoding ignoreCase();

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