@CollectionFeature.Require(absent = SUPPORTS_REMOVE)
  public void testSetCount_threeToOne_unsupported() {
    initThreeCopies();
    assertSetCountDecreasingFailure(e0(), 1);
  }

  // setCount with nulls:

  @CollectionSize.Require(absent = ZERO)
  @CollectionFeature.Require({SUPPORTS_REMOVE, ALLOWS_NULL_VALUES})
  public void testSetCount_removeNull_nullSupported() {
    initCollectionWithNullElement();

    }

    @Test
    @DisplayName("Delegation should handle null returns gracefully")
    void testNullReturnHandling() {
        // Given - configure delegate to return nulls
        when(mockDelegate.getRandom()).thenReturn(null);
        when(mockDelegate.getLocalAddr()).thenReturn(null);
        when(mockDelegate.getNetbiosHostname()).thenReturn(null);

    /**
     * Sets up HTML data for admin pages.
     * <p>
     * This method configures common data needed for admin pages including
     * editable flags, user roles, and forum links.
     * </p>
     *
     * @param runtime the action runtime context
     */
    @Override
    protected void setupHtmlData(final ActionRuntime runtime) {
        super.setupHtmlData(runtime);

        return keepAliveDurationNs
      }

      else -> {
        // No connections, idle or in use.
        return -1
      }
    }
  }

  /**
   * Prunes any leaked calls and then returns the number of remaining live calls on [connection].
   * Calls are leaked if the connection is tracking them but the application code has abandoned

import java.util.concurrent.TimeUnit;
import org.jspecify.annotations.NullUnmarked;
import org.jspecify.annotations.Nullable;

/**
 * An unbounded {@linkplain BlockingQueue blocking queue} that uses the same ordering rules as class
 * {@link PriorityQueue} and supplies blocking retrieval operations. While this queue is logically
 * unbounded, attempted additions may fail due to resource exhaustion (causing {@code

Now, for FastAPI, it will see the return type and make sure that what you return includes **only** the fields that are declared in the type.

FastAPI does several things internally with Pydantic to make sure that those same rules of class inheritance are not used for the returned data filtering, otherwise you could end up returning much more data than what you expected.

            result.setRequestedAt(toLocalDateTime(source.get("requestedAt")));
            result.setResponseTime(DfTypeUtil.toLong(source.get("responseTime")));
            result.setRoles(toStringArray(source.get("roles")));
            result.setSearchWord(DfTypeUtil.toString(source.get("searchWord")));
            result.setUser(DfTypeUtil.toString(source.get("user")));
            result.setUserAgent(DfTypeUtil.toString(source.get("userAgent")));

import org.codelibs.fess.util.ComponentUtil;
import org.dbflute.optional.OptionalEntity;

/**
 * Manages a dictionary file for synonyms.
 * This class handles reading, parsing, and updating files that contain
 * synonym rules. The file format supports both explicit mappings (e.g., `a => b`)
 * and equivalent synonyms (e.g., `a, b, c`).
 *
 * The class provides methods for retrieving, adding, updating, and

import org.jspecify.annotations.Nullable;

/**
 * Statistics about the performance of a {@link Cache}. Instances of this class are immutable.
 *
 * <p>Cache statistics are incremented according to the following rules:
 *
 * <ul>
 *   <li>When a cache lookup encounters an existing cache entry {@code hitCount} is incremented.
 *   <li>When a cache lookup first encounters a missing cache entry, a new entry is loaded.
 *       <ul>

import org.jspecify.annotations.Nullable;

/**
 * Statistics about the performance of a {@link Cache}. Instances of this class are immutable.
 *
 * <p>Cache statistics are incremented according to the following rules:
 *
 * <ul>
 *   <li>When a cache lookup encounters an existing cache entry {@code hitCount} is incremented.
 *   <li>When a cache lookup first encounters a missing cache entry, a new entry is loaded.
 *       <ul>