}

  /**
   * Sets the default value for {@code type}. The default value isn't used in testing {@link
   * Object#equals} because more than one sample instances are needed for testing inequality. To set
   * distinct values for equality testing, use {@link #setDistinctValues} instead.
   */
  @CanIgnoreReturnValue
  public <T> ClassSanityTester setDefault(Class<T> type, T value) {
    nullPointerTester.setDefault(type, value);

    while (values.hasNext()) {
      double value = values.next().doubleValue();
      count++;
      if (isFinite(value) && isFinite(mean)) {
        // Art of Computer Programming vol. 2, Knuth, 4.2.2, (15)
        mean += (value - mean) / count;
      } else {
        mean = calculateNewMeanNonFinite(mean, value);
      }
    }
    return mean;
  }

  /**

            final String key = e.getKey();
            Object value = e.getValue();
            if (value == null) {
                value = StringUtil.EMPTY;
            }
            if (value instanceof String || value == null) {
                return new Pair<>(key, value);
            }
            if (arrayFieldSet.contains(key)) {
                if (value instanceof String[]) {

 *
 * @param <T1>
 *            The type of the first value
 * @param <T2>
 *            The type of the second value
 * @param <T3>
 *            The type of the third value
 * @param <T4>
 *            The type of the fourth value
 */
public class Tuple4<T1, T2, T3, T4> {

    /** The first value */
    protected T1 value1;

    /** The second value */
    protected T2 value2;

    /** The third value */

        return createdAt;
    }

    public void setCreatedAt(LocalDateTime value) {
        registerModifiedProperty("createdAt");
        this.createdAt = value;
    }

    public LocalDateTime getUpdatedAt() {
        checkSpecifiedProperty("updatedAt");
        return updatedAt;
    }

    public void setUpdatedAt(LocalDateTime value) {
        registerModifiedProperty("updatedAt");
        this.updatedAt = value;

    }

    public void setElevateWordId(String value) {
        registerModifiedProperty("elevateWordId");
        this.elevateWordId = value;
    }

    public String getLabelTypeId() {
        checkSpecifiedProperty("labelTypeId");
        return convertEmptyToNull(labelTypeId);
    }

    public void setLabelTypeId(String value) {
        registerModifiedProperty("labelTypeId");

        checkSpecifiedProperty("value");
        return convertEmptyToNull(value);
    }

    public void setValue(String value) {
        registerModifiedProperty("value");
        this.value = value;
    }

    public String getVirtualHost() {
        checkSpecifiedProperty("virtualHost");
        return convertEmptyToNull(virtualHost);
    }

    public void setVirtualHost(String value) {

	ErrUnsupportedRelation = errors.New("unsupported relations")
	// ErrPrimaryKeyRequired primary keys required
	ErrPrimaryKeyRequired = errors.New("primary key required")
	// ErrModelValueRequired model value required
	ErrModelValueRequired = errors.New("model value required")
	// ErrModelAccessibleFieldsRequired model accessible fields required
	ErrModelAccessibleFieldsRequired = errors.New("model accessible fields required")

  private static class Foo implements Comparable<Foo> {
    final Integer value;

    Foo(int value) {
      this.value = value;
    }

    @Override
    public int hashCode() {
      return value.hashCode();
    }

    @Override
    public boolean equals(@Nullable Object o) {
      return (o instanceof Foo) && ((Foo) o).value.equals(value);
    }

    @Override
    public int compareTo(Foo other) {

{* ../../docs_src/query_params/tutorial001.py hl[9] *}

The query is the set of key-value pairs that go after the `?` in a URL, separated by `&` characters.

For example, in the URL:

```
http://127.0.0.1:8000/items/?skip=0&limit=10
```

...the query parameters are:

* `skip`: with a value of `0`
* `limit`: with a value of `10`

As they are part of the URL, they are "naturally" strings.