if (!(entry instanceof Multisets.ImmutableEntry)) {
        entriesArray[i] = Multisets.immutableEntry(element, count);
      }
    }
    return new JdkBackedImmutableMultiset<>(delegateMap, asImmutableList(entriesArray), size);
  }

  private JdkBackedImmutableMultiset(
      Map<E, Integer> delegateMap, ImmutableList<Entry<E>> entries, long size) {
    this.delegateMap = delegateMap;
    this.entries = entries;

import java.util.Collection;
import org.jspecify.annotations.Nullable;

/** Never actually created; instead delegates to JdkBackedImmutableMultiset. */
final class RegularImmutableMultiset<E> extends ImmutableMultiset<E> {
  static final ImmutableMultiset<Object> EMPTY =
      JdkBackedImmutableMultiset.create(ImmutableList.of());

  RegularImmutableMultiset() {}

      }
      hashCode += hash ^ count;
      entryArray[index++] = newEntry;
      hashTable[bucket] = newEntry;
      size += count;
    }

    return hashFloodingDetected(hashTable)
        ? JdkBackedImmutableMultiset.create(asImmutableList(entryArray))
        : new RegularImmutableMultiset<E>(
            entryArray, hashTable, Ints.saturatedCast(size), hashCode, null);
  }

      return copyOf(contents);
    }

    @VisibleForTesting
    ImmutableMultiset<E> buildJdkBacked() {
      if (contents.isEmpty()) {
        return of();
      }
      return JdkBackedImmutableMultiset.create(contents.entrySet());
    }
  }

  static final class ElementSet<E> extends ImmutableSet.Indexed<E> {
    private final List<Entry<E>> entries;
    // TODO(cpovirk): @Weak?