*
 * @author Ben Yu
 * @since 13.0
 */
public final class ImmutableTypeToInstanceMap<B> extends ForwardingMap<TypeToken<? extends B>, B>
    implements TypeToInstanceMap<B> {

  /** Returns an empty type to instance map. */
  public static <B> ImmutableTypeToInstanceMap<B> of() {
    return new ImmutableTypeToInstanceMap<>(ImmutableMap.<TypeToken<? extends B>, B>of());
  }

  /** Returns a new builder. */

    return suite;
  }

  public void testEmpty() {
    assertEquals(0, ImmutableTypeToInstanceMap.of().size());
  }

  public void testPrimitiveAndWrapper() {
    ImmutableTypeToInstanceMap<Number> map =
        ImmutableTypeToInstanceMap.<Number>builder()
            .put(Integer.class, 0)
            .put(int.class, 1)
            .build();
    assertEquals(2, map.size());

 *
 * @param <B> the common supertype that all entries must share; often this is simply {@link Object}
 * @author Ben Yu
 * @since 13.0
 */
@DoNotMock("Use ImmutableTypeToInstanceMap or MutableTypeToInstanceMap")
public interface TypeToInstanceMap<B extends @Nullable Object>
    extends Map<TypeToken<? extends @NonNull B>, B> {

  /**

import java.util.Iterator;
import java.util.Map;
import java.util.Set;
import org.jspecify.annotations.NonNull;
import org.jspecify.annotations.Nullable;

/**
 * A mutable type-to-instance map. See also {@link ImmutableTypeToInstanceMap}.
 *
 * @author Ben Yu
 * @since 13.0
 */
public final class MutableTypeToInstanceMap<B extends @Nullable Object>
    extends ForwardingMap<TypeToken<? extends @NonNull B>, B> implements TypeToInstanceMap<B> {