Annotations on generic parameter types not copied to implementation

[Randgalt]

Given:

import org.immutables.value.Value;

import javax.validation.constraints.NotEmpty;

import java.util.Optional;

@Value.Style(passAnnotations = NotEmpty.class)
@Value.Immutable
public interface Foo
{
    Optional<@NotEmpty String> value();
}

Immutables generates:

  /**
   * @return The value of the {@code value} attribute
   */
  @Override
  public Optional<String> value() {     // should be public Optional<@NotEmpty String> value();
    return Optional.ofNullable(value);
  }