register["T6"] = riscv.REG_T6

	// Go runtime register names.
	register["g"] = riscv.REG_G
	register["CTXT"] = riscv.REG_CTXT
	register["TMP"] = riscv.REG_TMP

	// ABI names for floating point register.
	register["FT0"] = riscv.REG_FT0
	register["FT1"] = riscv.REG_FT1
	register["FT2"] = riscv.REG_FT2
	register["FT3"] = riscv.REG_FT3
	register["FT4"] = riscv.REG_FT4
	register["FT5"] = riscv.REG_FT5

  // the last 300sec is used).
  // +optional
  optional HPAScalingRules scaleDown = 2;
}

// HorizontalPodAutoscalerCondition describes the state of
// a HorizontalPodAutoscaler at a certain point.
message HorizontalPodAutoscalerCondition {
  // type describes the current condition
  optional string type = 1;

  // status is the status of the condition (True, False, Unknown)
  optional string status = 2;

  // +optional
  optional HorizontalPodAutoscalerStatus status = 3;
}

// HorizontalPodAutoscalerCondition describes the state of
// a HorizontalPodAutoscaler at a certain point.
message HorizontalPodAutoscalerCondition {
  // type describes the current condition
  optional string type = 1;

  // status is the status of the condition (True, False, Unknown)
  optional string status = 2;

// on remote clusters, and creating replication rules on local and peer
// clusters.
func (c *SiteReplicationSys) MakeBucketHook(ctx context.Context, bucket string, opts MakeBucketOptions) error {
	// At this point, the local bucket is created.

	c.RLock()
	defer c.RUnlock()
	if !c.enabled {
		return nil
	}

	optsMap := make(map[string]string)
	if opts.LockEnabled {
		optsMap["lockEnabled"] = "true"

```Python hl_lines="1  4"
{!> ../../docs_src/python_types/tutorial009b.py!}
```

////

#### Sử dụng `Union` hay `Optional`

If you are using a Python version below 3.10, here's a tip from my very **subjective** point of view:

Nếu bạn đang sử dụng phiên bản Python dưới 3.10, đây là một mẹo từ ý kiến rất "chủ quan" của tôi:

* 🚨 Tránh sử dụng `Optional[SomeType]`
* Thay vào đó ✨ **sử dụng `Union[SomeType, None]`** ✨.

   *   <li>execution will not stop until the task queue is empty.
   *   <li>tasks will begin execution with the thread marked as not interrupted - any interruption
   *       applies only to the task that was running at the point of interruption.
   *   <li>if the thread was interrupted before the SequentialExecutor's worker begins execution,
   *       the interrupt will be restored to the thread after it completes so that its {@code

      assertEquals(expected, string);
      if (howManyChecked++ == 5) {
        break;
      }
    }

    // We left the last iterator pointing to "b". But a new iterator should
    // always point to "a".
    assertEquals("a", cycle.iterator().next());
  }

  public void testCycle_emptyIterable() {
    FluentIterable<Integer> cycle = FluentIterable.<Integer>of().cycle();

     * converter.apply(), anyway. If clients use only converter.convert(), then their nullness
     * checkers are unlikely to ever look at the annotations on this declaration.
     *
     * Historical note: At one point, we'd declared this method as accepting and returning nullable
     * values. For details on that, see earlier revisions of this file.
     */
    return convert(a);
  }

  /**

   * next printing line. (Applicable also to display devices.) Where appropriate, this character may
   * have the meaning "New Line" (NL), a format effector which controls the movement of the printing
   * point to the first printing position on the next printing line. Use of this convention requires
   * agreement between sender and recipient of data.
   *
   * @since 8.0
   */
  public static final byte LF = 10;

              factory, args, i, generateDummyArg(param, newFreshValueGenerator()))) {
        // If the implementation uses identityHashCode(), referential equality is
        // probably intended. So no point in using an equal-but-different factory argument.
        // We check twice to avoid confusion caused by accidental hash collision.
        equalArgs.set(i, shouldBeEqualArg);
      }
    }
    return equalArgs;
  }