/*
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 * ORACLE PROPRIETARY/CONFIDENTIAL. Use is subject to license terms.
 *
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package java.util;

/**
 * A collection that contains no duplicate elements. More formally, sets
 * contain no pair of elements {@code e1} and {@code e2} such that
 * {@code e1.equals(e2)}, and at most one null element. As implied by
 * its name, this interface models the mathematical <i>set</i> abstraction.
 *
 * <p>The {@code Set} interface places additional stipulations, beyond those
 * inherited from the {@code Collection} interface, on the contracts of all
 * constructors and on the contracts of the {@code add}, {@code equals} and
 * {@code hashCode} methods. Declarations for other inherited methods are
 * also included here for convenience. (The specifications accompanying these
 * declarations have been tailored to the {@code Set} interface, but they do
 * not contain any additional stipulations.)
 *
 * <p>The additional stipulation on constructors is, not surprisingly,
 * that all constructors must create a set that contains no duplicate elements
 * (as defined above).
 *
 * <p>Note: Great care must be exercised if mutable objects are used as set
 * elements. The behavior of a set is not specified if the value of an object
 * is changed in a manner that affects {@code equals} comparisons while the
 * object is an element in the set. A special case of this prohibition is
 * that it is not permissible for a set to contain itself as an element.
 *
 * <p>Some set implementations have restrictions on the elements that
 * they may contain. For example, some implementations prohibit null elements,
 * and some have restrictions on the types of their elements. Attempting to
 * add an ineligible element throws an unchecked exception, typically
 * {@code NullPointerException} or {@code ClassCastException}. Attempting
 * to query the presence of an ineligible element may throw an exception,
 * or it may simply return false; some implementations will exhibit the former
 * behavior and some will exhibit the latter. More generally, attempting an
 * operation on an ineligible element whose completion would not result in
 * the insertion of an ineligible element into the set may throw an
 * exception or it may succeed, at the option of the implementation.
 * Such exceptions are marked as "optional" in the specification for this
 * interface.
 *
 * <h2><a id="unmodifiable">Unmodifiable Sets</a></h2>
 * <p>The {@link Set#of(Object...) Set.of} and
 * {@link Set#copyOf Set.copyOf} static factory methods
 * provide a convenient way to create unmodifiable sets. The {@code Set}
 * instances created by these methods have the following characteristics:
 *
 * <ul>
 * <li>They are <a href="Collection.html#unmodifiable"><i>unmodifiable</i></a>. Elements cannot
 * be added or removed. Calling any mutator method on the Set
 * will always cause {@code UnsupportedOperationException} to be thrown.
 * However, if the contained elements are themselves mutable, this may cause the
 * Set to behave inconsistently or its contents to appear to change.
 * <li>They disallow {@code null} elements. Attempts to create them with
 * {@code null} elements result in {@code NullPointerException}.
 * <li>They are serializable if all elements are serializable.
 * <li>They reject duplicate elements at creation time. Duplicate elements
 * passed to a static factory method result in {@code IllegalArgumentException}.
 * <li>The iteration order of set elements is unspecified and is subject to change.
 * <li>They are <a href="../lang/doc-files/ValueBased.html">value-based</a>.
 * Callers should make no assumptions about the identity of the returned instances.
 * Factories are free to create new instances or reuse existing ones. Therefore,
 * identity-sensitive operations on these instances (reference equality ({@code ==}),
 * identity hash code, and synchronization) are unreliable and should be avoided.
 * <li>They are serialized as specified on the
 * <a href="{@docRoot}/serialized-form.html#java.util.CollSer">Serialized Form</a>
 * page.
 * </ul>
 *
 * <p>This interface is a member of the
 * <a href="{@docRoot}/java.base/java/util/package-summary.html#CollectionsFramework">
 * Java Collections Framework</a>.
 *
 * @param <E> the type of elements maintained by this set
 *
 * @author Josh Bloch
 * @author Neal Gafter
 * @see Collection
 * @see List
 * @see SortedSet
 * @see HashSet
 * @see TreeSet
 * @see AbstractSet
 * @see Collections#singleton(java.lang.Object)
 * @see Collections#EMPTY_SET
 * @since 1.2
 */

public interface Set<E> extends Collection<E> {
 // Query Operations

 /**
 * Returns the number of elements in this set (its cardinality). If this
 * set contains more than {@code Integer.MAX_VALUE} elements, returns
 * {@code Integer.MAX_VALUE}.
 *
 * @return the number of elements in this set (its cardinality)
 */
 int size();

 /**
 * Returns {@code true} if this set contains no elements.
 *
 * @return {@code true} if this set contains no elements
 */
 boolean isEmpty();

 /**
 * Returns {@code true} if this set contains the specified element.
 * More formally, returns {@code true} if and only if this set
 * contains an element {@code e} such that
 * {@code Objects.equals(o, e)}.
 *
 * @param o element whose presence in this set is to be tested
 * @return {@code true} if this set contains the specified element
 * @throws ClassCastException if the type of the specified element
 * is incompatible with this set
 * (<a href="Collection.html#optional-restrictions">optional</a>)
 * @throws NullPointerException if the specified element is null and this
 * set does not permit null elements
 * (<a href="Collection.html#optional-restrictions">optional</a>)
 */
 boolean contains(Object o);

 /**
 * Returns an iterator over the elements in this set. The elements are
 * returned in no particular order (unless this set is an instance of some
 * class that provides a guarantee).
 *
 * @return an iterator over the elements in this set
 */
 Iterator<E> iterator();

 /**
 * Returns an array containing all of the elements in this set.
 * If this set makes any guarantees as to what order its elements
 * are returned by its iterator, this method must return the
 * elements in the same order.
 *
 * <p>The returned array will be "safe" in that no references to it
 * are maintained by this set. (In other words, this method must
 * allocate a new array even if this set is backed by an array).
 * The caller is thus free to modify the returned array.
 *
 * <p>This method acts as bridge between array-based and collection-based
 * APIs.
 *
 * @return an array containing all the elements in this set
 */
 Object[] toArray();

 /**
 * Returns an array containing all of the elements in this set; the
 * runtime type of the returned array is that of the specified array.
 * If the set fits in the specified array, it is returned therein.
 * Otherwise, a new array is allocated with the runtime type of the
 * specified array and the size of this set.
 *
 * <p>If this set fits in the specified array with room to spare
 * (i.e., the array has more elements than this set), the element in
 * the array immediately following the end of the set is set to
 * {@code null}. (This is useful in determining the length of this
 * set <i>only</i> if the caller knows that this set does not contain
 * any null elements.)
 *
 * <p>If this set makes any guarantees as to what order its elements
 * are returned by its iterator, this method must return the elements
 * in the same order.
 *
 * <p>Like the {@link #toArray()} method, this method acts as bridge between
 * array-based and collection-based APIs. Further, this method allows
 * precise control over the runtime type of the output array, and may,
 * under certain circumstances, be used to save allocation costs.
 *
 * <p>Suppose {@code x} is a set known to contain only strings.
 * The following code can be used to dump the set into a newly allocated
 * array of {@code String}:
 *
 * <pre>
 * String[] y = x.toArray(new String[0]);</pre>
 *
 * Note that {@code toArray(new Object[0])} is identical in function to
 * {@code toArray()}.
 *
 * @param a the array into which the elements of this set are to be
 * stored, if it is big enough; otherwise, a new array of the same
 * runtime type is allocated for this purpose.
 * @return an array containing all the elements in this set
 * @throws ArrayStoreException if the runtime type of the specified array
 * is not a supertype of the runtime type of every element in this
 * set
 * @throws NullPointerException if the specified array is null
 */
 <T> T[] toArray(T[] a);


 // Modification Operations

 /**
 * Adds the specified element to this set if it is not already present
 * (optional operation). More formally, adds the specified element
 * {@code e} to this set if the set contains no element {@code e2}
 * such that
 * {@code Objects.equals(e, e2)}.
 * If this set already contains the element, the call leaves the set
 * unchanged and returns {@code false}. In combination with the
 * restriction on constructors, this ensures that sets never contain
 * duplicate elements.
 *
 * <p>The stipulation above does not imply that sets must accept all
 * elements; sets may refuse to add any particular element, including
 * {@code null}, and throw an exception, as described in the
 * specification for {@link Collection#add Collection.add}.
 * Individual set implementations should clearly document any
 * restrictions on the elements that they may contain.
 *
 * @param e element to be added to this set
 * @return {@code true} if this set did not already contain the specified
 * element
 * @throws UnsupportedOperationException if the {@code add} operation
 * is not supported by this set
 * @throws ClassCastException if the class of the specified element
 * prevents it from being added to this set
 * @throws NullPointerException if the specified element is null and this
 * set does not permit null elements
 * @throws IllegalArgumentException if some property of the specified element
 * prevents it from being added to this set
 */
 boolean add(E e);


 /**
 * Removes the specified element from this set if it is present
 * (optional operation). More formally, removes an element {@code e}
 * such that
 * {@code Objects.equals(o, e)}, if
 * this set contains such an element. Returns {@code true} if this set
 * contained the element (or equivalently, if this set changed as a
 * result of the call). (This set will not contain the element once the
 * call returns.)
 *
 * @param o object to be removed from this set, if present
 * @return {@code true} if this set contained the specified element
 * @throws ClassCastException if the type of the specified element
 * is incompatible with this set
 * (<a href="Collection.html#optional-restrictions">optional</a>)
 * @throws NullPointerException if the specified element is null and this
 * set does not permit null elements
 * (<a href="Collection.html#optional-restrictions">optional</a>)
 * @throws UnsupportedOperationException if the {@code remove} operation
 * is not supported by this set
 */
 boolean remove(Object o);


 // Bulk Operations

 /**
 * Returns {@code true} if this set contains all of the elements of the
 * specified collection. If the specified collection is also a set, this
 * method returns {@code true} if it is a <i>subset</i> of this set.
 *
 * @param c collection to be checked for containment in this set
 * @return {@code true} if this set contains all of the elements of the
 * specified collection
 * @throws ClassCastException if the types of one or more elements
 * in the specified collection are incompatible with this
 * set
 * (<a href="Collection.html#optional-restrictions">optional</a>)
 * @throws NullPointerException if the specified collection contains one
 * or more null elements and this set does not permit null
 * elements
 * (<a href="Collection.html#optional-restrictions">optional</a>),
 * or if the specified collection is null
 * @see #contains(Object)
 */
 boolean containsAll(Collection<?> c);

 /**
 * Adds all of the elements in the specified collection to this set if
 * they're not already present (optional operation). If the specified
 * collection is also a set, the {@code addAll} operation effectively
 * modifies this set so that its value is the <i>union</i> of the two
 * sets. The behavior of this operation is undefined if the specified
 * collection is modified while the operation is in progress.
 *
 * @param c collection containing elements to be added to this set
 * @return {@code true} if this set changed as a result of the call
 *
 * @throws UnsupportedOperationException if the {@code addAll} operation
 * is not supported by this set
 * @throws ClassCastException if the class of an element of the
 * specified collection prevents it from being added to this set
 * @throws NullPointerException if the specified collection contains one
 * or more null elements and this set does not permit null
 * elements, or if the specified collection is null
 * @throws IllegalArgumentException if some property of an element of the
 * specified collection prevents it from being added to this set
 * @see #add(Object)
 */
 boolean addAll(Collection<? extends E> c);

 /**
 * Retains only the elements in this set that are contained in the
 * specified collection (optional operation). In other words, removes
 * from this set all of its elements that are not contained in the
 * specified collection. If the specified collection is also a set, this
 * operation effectively modifies this set so that its value is the
 * <i>intersection</i> of the two sets.
 *
 * @param c collection containing elements to be retained in this set
 * @return {@code true} if this set changed as a result of the call
 * @throws UnsupportedOperationException if the {@code retainAll} operation
 * is not supported by this set
 * @throws ClassCastException if the class of an element of this set
 * is incompatible with the specified collection
 * (<a href="Collection.html#optional-restrictions">optional</a>)
 * @throws NullPointerException if this set contains a null element and the
 * specified collection does not permit null elements
 * (<a href="Collection.html#optional-restrictions">optional</a>),
 * or if the specified collection is null
 * @see #remove(Object)
 */
 boolean retainAll(Collection<?> c);

 /**
 * Removes from this set all of its elements that are contained in the
 * specified collection (optional operation). If the specified
 * collection is also a set, this operation effectively modifies this
 * set so that its value is the <i>asymmetric set difference</i> of
 * the two sets.
 *
 * @param c collection containing elements to be removed from this set
 * @return {@code true} if this set changed as a result of the call
 * @throws UnsupportedOperationException if the {@code removeAll} operation
 * is not supported by this set
 * @throws ClassCastException if the class of an element of this set
 * is incompatible with the specified collection
 * (<a href="Collection.html#optional-restrictions">optional</a>)
 * @throws NullPointerException if this set contains a null element and the
 * specified collection does not permit null elements
 * (<a href="Collection.html#optional-restrictions">optional</a>),
 * or if the specified collection is null
 * @see #remove(Object)
 * @see #contains(Object)
 */
 boolean removeAll(Collection<?> c);

 /**
 * Removes all of the elements from this set (optional operation).
 * The set will be empty after this call returns.
 *
 * @throws UnsupportedOperationException if the {@code clear} method
 * is not supported by this set
 */
 void clear();


 // Comparison and hashing

 /**
 * Compares the specified object with this set for equality. Returns
 * {@code true} if the specified object is also a set, the two sets
 * have the same size, and every member of the specified set is
 * contained in this set (or equivalently, every member of this set is
 * contained in the specified set). This definition ensures that the
 * equals method works properly across different implementations of the
 * set interface.
 *
 * @param o object to be compared for equality with this set
 * @return {@code true} if the specified object is equal to this set
 */
 boolean equals(Object o);

 /**
 * Returns the hash code value for this set. The hash code of a set is
 * defined to be the sum of the hash codes of the elements in the set,
 * where the hash code of a {@code null} element is defined to be zero.
 * This ensures that {@code s1.equals(s2)} implies that
 * {@code s1.hashCode()==s2.hashCode()} for any two sets {@code s1}
 * and {@code s2}, as required by the general contract of
 * {@link Object#hashCode}.
 *
 * @return the hash code value for this set
 * @see Object#equals(Object)
 * @see Set#equals(Object)
 */
 int hashCode();

 /**
 * Creates a {@code Spliterator} over the elements in this set.
 *
 * <p>The {@code Spliterator} reports {@link Spliterator#DISTINCT}.
 * Implementations should document the reporting of additional
 * characteristic values.
 *
 * @implSpec
 * The default implementation creates a
 * <em><a href="Spliterator.html#binding">late-binding</a></em> spliterator
 * from the set's {@code Iterator}. The spliterator inherits the
 * <em>fail-fast</em> properties of the set's iterator.
 * <p>
 * The created {@code Spliterator} additionally reports
 * {@link Spliterator#SIZED}.
 *
 * @implNote
 * The created {@code Spliterator} additionally reports
 * {@link Spliterator#SUBSIZED}.
 *
 * @return a {@code Spliterator} over the elements in this set
 * @since 1.8
 */
 @Override
 default Spliterator<E> spliterator() {
 return Spliterators.spliterator(this, Spliterator.DISTINCT);
 }

 /**
 * Returns an unmodifiable set containing zero elements.
 * See <a href="#unmodifiable">Unmodifiable Sets</a> for details.
 *
 * @param <E> the {@code Set}'s element type
 * @return an empty {@code Set}
 *
 * @since 9
 */
 static <E> Set<E> of() {
 return ImmutableCollections.emptySet();
 }

 /**
 * Returns an unmodifiable set containing one element.
 * See <a href="#unmodifiable">Unmodifiable Sets</a> for details.
 *
 * @param <E> the {@code Set}'s element type
 * @param e1 the single element
 * @return a {@code Set} containing the specified element
 * @throws NullPointerException if the element is {@code null}
 *
 * @since 9
 */
 static <E> Set<E> of(E e1) {
 return new ImmutableCollections.Set12<>(e1);
 }

 /**
 * Returns an unmodifiable set containing two elements.
 * See <a href="#unmodifiable">Unmodifiable Sets</a> for details.
 *
 * @param <E> the {@code Set}'s element type
 * @param e1 the first element
 * @param e2 the second element
 * @return a {@code Set} containing the specified elements
 * @throws IllegalArgumentException if the elements are duplicates
 * @throws NullPointerException if an element is {@code null}
 *
 * @since 9
 */
 static <E> Set<E> of(E e1, E e2) {
 return new ImmutableCollections.Set12<>(e1, e2);
 }

 /**
 * Returns an unmodifiable set containing three elements.
 * See <a href="#unmodifiable">Unmodifiable Sets</a> for details.
 *
 * @param <E> the {@code Set}'s element type
 * @param e1 the first element
 * @param e2 the second element
 * @param e3 the third element
 * @return a {@code Set} containing the specified elements
 * @throws IllegalArgumentException if there are any duplicate elements
 * @throws NullPointerException if an element is {@code null}
 *
 * @since 9
 */
 static <E> Set<E> of(E e1, E e2, E e3) {
 return new ImmutableCollections.SetN<>(e1, e2, e3);
 }

 /**
 * Returns an unmodifiable set containing four elements.
 * See <a href="#unmodifiable">Unmodifiable Sets</a> for details.
 *
 * @param <E> the {@code Set}'s element type
 * @param e1 the first element
 * @param e2 the second element
 * @param e3 the third element
 * @param e4 the fourth element
 * @return a {@code Set} containing the specified elements
 * @throws IllegalArgumentException if there are any duplicate elements
 * @throws NullPointerException if an element is {@code null}
 *
 * @since 9
 */
 static <E> Set<E> of(E e1, E e2, E e3, E e4) {
 return new ImmutableCollections.SetN<>(e1, e2, e3, e4);
 }

 /**
 * Returns an unmodifiable set containing five elements.
 * See <a href="#unmodifiable">Unmodifiable Sets</a> for details.
 *
 * @param <E> the {@code Set}'s element type
 * @param e1 the first element
 * @param e2 the second element
 * @param e3 the third element
 * @param e4 the fourth element
 * @param e5 the fifth element
 * @return a {@code Set} containing the specified elements
 * @throws IllegalArgumentException if there are any duplicate elements
 * @throws NullPointerException if an element is {@code null}
 *
 * @since 9
 */
 static <E> Set<E> of(E e1, E e2, E e3, E e4, E e5) {
 return new ImmutableCollections.SetN<>(e1, e2, e3, e4, e5);
 }

 /**
 * Returns an unmodifiable set containing six elements.
 * See <a href="#unmodifiable">Unmodifiable Sets</a> for details.
 *
 * @param <E> the {@code Set}'s element type
 * @param e1 the first element
 * @param e2 the second element
 * @param e3 the third element
 * @param e4 the fourth element
 * @param e5 the fifth element
 * @param e6 the sixth element
 * @return a {@code Set} containing the specified elements
 * @throws IllegalArgumentException if there are any duplicate elements
 * @throws NullPointerException if an element is {@code null}
 *
 * @since 9
 */
 static <E> Set<E> of(E e1, E e2, E e3, E e4, E e5, E e6) {
 return new ImmutableCollections.SetN<>(e1, e2, e3, e4, e5,
 e6);
 }

 /**
 * Returns an unmodifiable set containing seven elements.
 * See <a href="#unmodifiable">Unmodifiable Sets</a> for details.
 *
 * @param <E> the {@code Set}'s element type
 * @param e1 the first element
 * @param e2 the second element
 * @param e3 the third element
 * @param e4 the fourth element
 * @param e5 the fifth element
 * @param e6 the sixth element
 * @param e7 the seventh element
 * @return a {@code Set} containing the specified elements
 * @throws IllegalArgumentException if there are any duplicate elements
 * @throws NullPointerException if an element is {@code null}
 *
 * @since 9
 */
 static <E> Set<E> of(E e1, E e2, E e3, E e4, E e5, E e6, E e7) {
 return new ImmutableCollections.SetN<>(e1, e2, e3, e4, e5,
 e6, e7);
 }

 /**
 * Returns an unmodifiable set containing eight elements.
 * See <a href="#unmodifiable">Unmodifiable Sets</a> for details.
 *
 * @param <E> the {@code Set}'s element type
 * @param e1 the first element
 * @param e2 the second element
 * @param e3 the third element
 * @param e4 the fourth element
 * @param e5 the fifth element
 * @param e6 the sixth element
 * @param e7 the seventh element
 * @param e8 the eighth element
 * @return a {@code Set} containing the specified elements
 * @throws IllegalArgumentException if there are any duplicate elements
 * @throws NullPointerException if an element is {@code null}
 *
 * @since 9
 */
 static <E> Set<E> of(E e1, E e2, E e3, E e4, E e5, E e6, E e7, E e8) {
 return new ImmutableCollections.SetN<>(e1, e2, e3, e4, e5,
 e6, e7, e8);
 }

 /**
 * Returns an unmodifiable set containing nine elements.
 * See <a href="#unmodifiable">Unmodifiable Sets</a> for details.
 *
 * @param <E> the {@code Set}'s element type
 * @param e1 the first element
 * @param e2 the second element
 * @param e3 the third element
 * @param e4 the fourth element
 * @param e5 the fifth element
 * @param e6 the sixth element
 * @param e7 the seventh element
 * @param e8 the eighth element
 * @param e9 the ninth element
 * @return a {@code Set} containing the specified elements
 * @throws IllegalArgumentException if there are any duplicate elements
 * @throws NullPointerException if an element is {@code null}
 *
 * @since 9
 */
 static <E> Set<E> of(E e1, E e2, E e3, E e4, E e5, E e6, E e7, E e8, E e9) {
 return new ImmutableCollections.SetN<>(e1, e2, e3, e4, e5,
 e6, e7, e8, e9);
 }

 /**
 * Returns an unmodifiable set containing ten elements.
 * See <a href="#unmodifiable">Unmodifiable Sets</a> for details.
 *
 * @param <E> the {@code Set}'s element type
 * @param e1 the first element
 * @param e2 the second element
 * @param e3 the third element
 * @param e4 the fourth element
 * @param e5 the fifth element
 * @param e6 the sixth element
 * @param e7 the seventh element
 * @param e8 the eighth element
 * @param e9 the ninth element
 * @param e10 the tenth element
 * @return a {@code Set} containing the specified elements
 * @throws IllegalArgumentException if there are any duplicate elements
 * @throws NullPointerException if an element is {@code null}
 *
 * @since 9
 */
 static <E> Set<E> of(E e1, E e2, E e3, E e4, E e5, E e6, E e7, E e8, E e9, E e10) {
 return new ImmutableCollections.SetN<>(e1, e2, e3, e4, e5,
 e6, e7, e8, e9, e10);
 }

 /**
 * Returns an unmodifiable set containing an arbitrary number of elements.
 * See <a href="#unmodifiable">Unmodifiable Sets</a> for details.
 *
 * @apiNote
 * This method also accepts a single array as an argument. The element type of
 * the resulting set will be the component type of the array, and the size of
 * the set will be equal to the length of the array. To create a set with
 * a single element that is an array, do the following:
 *
 * <pre>{@code
 * String[] array = ... ;
 * Set<String[]> list = Set.<String[]>of(array);
 * }</pre>
 *
 * This will cause the {@link Set#of(Object) Set.of(E)} method
 * to be invoked instead.
 *
 * @param <E> the {@code Set}'s element type
 * @param elements the elements to be contained in the set
 * @return a {@code Set} containing the specified elements
 * @throws IllegalArgumentException if there are any duplicate elements
 * @throws NullPointerException if an element is {@code null} or if the array is {@code null}
 *
 * @since 9
 */
 @SafeVarargs
 @SuppressWarnings("varargs")
 static <E> Set<E> of(E... elements) {
 switch (elements.length) { // implicit null check of elements
 case 0:
 return ImmutableCollections.emptySet();
 case 1:
 return new ImmutableCollections.Set12<>(elements[0]);
 case 2:
 return new ImmutableCollections.Set12<>(elements[0], elements[1]);
 default:
 return new ImmutableCollections.SetN<>(elements);
 }
 }

 /**
 * Returns an <a href="#unmodifiable">unmodifiable Set</a> containing the elements
 * of the given Collection. The given Collection must not be null, and it must not
 * contain any null elements. If the given Collection contains duplicate elements,
 * an arbitrary element of the duplicates is preserved. If the given Collection is
 * subsequently modified, the returned Set will not reflect such modifications.
 *
 * @implNote
 * If the given Collection is an <a href="#unmodifiable">unmodifiable Set</a>,
 * calling copyOf will generally not create a copy.
 *
 * @param <E> the {@code Set}'s element type
 * @param coll a {@code Collection} from which elements are drawn, must be non-null
 * @return a {@code Set} containing the elements of the given {@code Collection}
 * @throws NullPointerException if coll is null, or if it contains any nulls
 * @since 10
 */
 @SuppressWarnings("unchecked")
 static <E> Set<E> copyOf(Collection<? extends E> coll) {
 if (coll instanceof ImmutableCollections.AbstractImmutableSet) {
 return (Set<E>)coll;
 } else {
 return (Set<E>)Set.of(new HashSet<>(coll).toArray());
 }
 }
}