* Instead ✨ **use `Union[SomeType, None]`** ✨.

Both are equivalent and underneath they are the same, but I would recommend `Union` instead of `Optional` because the word "**optional**" would seem to imply that the value is optional, and it actually means "it can be `None`", even if it's not optional and is still required.

I think `Union[SomeType, None]` is more explicit about what it means.

   * Returns an {@link ImmutableSortedSet} containing the same values in the given domain
   * {@linkplain RangeSet#contains contained} by this range set.
   *
   * <p><b>Note:</b> {@code a.asSet(d).equals(b.asSet(d))} does not imply {@code a.equals(b)}! For
   * example, {@code a} and {@code b} could be {@code [2..4]} and {@code (1..5)}, or the empty
   * ranges {@code [3..3)} and {@code [4..4)}.
   *

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import org.apache.maven.execution.MavenSession;
import org.apache.maven.impl.DefaultArtifact;
import org.apache.maven.impl.DefaultArtifactCoordinatesFactory;
import org.apache.maven.impl.DefaultArtifactResolver;
import org.apache.maven.impl.DefaultModelVersionParser;
import org.apache.maven.impl.DefaultRepositoryFactory;
import org.apache.maven.impl.DefaultVersionParser;
import org.apache.maven.impl.InternalSession;

import org.eclipse.aether.internal.impl.SimpleLocalRepositoryManagerFactory;
import org.eclipse.aether.internal.impl.scope.ManagedDependencyContextRefiner;
import org.eclipse.aether.internal.impl.scope.ManagedScopeDeriver;
import org.eclipse.aether.internal.impl.scope.ManagedScopeSelector;
import org.eclipse.aether.internal.impl.scope.OptionalDependencySelector;
import org.eclipse.aether.internal.impl.scope.ScopeDependencySelector;

            DfsReferralDataImpl impl = createInitializedDfsReferralDataImpl();

            // Create a chain of operations
            assertDoesNotThrow(() -> {
                impl.fixupHost("server1.example.com");
                impl.fixupDomain("domain.com");
                impl.fixupHost("server2.example.com");
                impl.fixupDomain("otherdomain.com");
            });
        }

       */
      copyIfNecessary();
      this.impl = this.impl.combine(other.impl);
      return this;
    }

    @Override
    public ImmutableSet<E> build() {
      requireNonNull(impl); // see the comment on the field
      forceCopy = true;
      impl = impl.review();
      return impl.build();
    }
  }

import org.codelibs.fess.unit.UnitFessTestCase;
import org.lastaflute.di.core.assembler.AutoBindingDefFactory;
import org.lastaflute.di.core.customizer.ComponentCustomizer;
import org.lastaflute.di.core.meta.impl.InstanceDefFactory;
import org.lastaflute.di.naming.NamingConvention;
// NamingConventionImpl removed - using mock instead

public class PagerCreatorTest extends UnitFessTestCase {

    private PagerCreator pagerCreator;

    };

    abstract ExecutionListWrapper newExecutionList();
  }

  private ThreadPoolExecutor executorService;
  private CountDownLatch listenerLatch;
  private ExecutionListWrapper list;

  @Param Impl impl;

  @Param({"1", "5", "10"})
  int numListeners;

  private final Runnable listener =
      new Runnable() {
        @Override
        public void run() {
          listenerLatch.countDown();

import org.apache.maven.execution.MavenExecutionRequest;
import org.apache.maven.execution.MavenSession;
import org.apache.maven.impl.InternalSession;
import org.apache.maven.internal.impl.DefaultLookup;
import org.apache.maven.internal.impl.DefaultSessionFactory;
import org.apache.maven.internal.impl.InternalMavenSession;
import org.apache.maven.model.Build;
import org.apache.maven.model.Dependency;
import org.apache.maven.model.Exclusion;