This is similar to `null` not being assignable to primitive types in Java.

To fix this problem, you have two options:

- remove the `@Optional` annotation
- or use the boxed type (e.g Integer instead of int) if you intend to make the property nullable


[[implementation_unknown]]
== Cannot use an input with an unknown implementation

        .snapshot();
  }

  /**
   * Returns a {@link Collector} which accumulates statistics from a {@link java.util.stream.Stream}
   * of any type of boxed {@link Number} into a {@link Stats}. Use by calling {@code
   * boxedNumericStream.collect(toStats())}. The numbers will be converted to {@code double} values
   * (which may cause loss of precision).
   *

func TestRaceIssue5654(t *testing.T) {
	text := `Friends, Romans, countrymen, lend me your ears;
I come to bury Caesar, not to praise him.
The evil that men do lives after them;
The good is oft interred with their bones;
So let it be with Caesar. The noble Brutus
Hath told you Caesar was ambitious:
If it were so, it was a grievous fault,
And grievously hath Caesar answer'd it.
Here, under leave of Brutus and the rest -