Add equals/hashCode support for Unpaged.

Closes #3061

src/main/java/org/springframework/data/domain/Unpaged.java

@@ -89,4 +89,21 @@ final class Unpaged implements Pageable {
 
 		throw new UnsupportedOperationException();
 	}
+
+	@Override
+	public boolean equals(Object o) {
+		if (this == o) {
+			return true;
+		}
+		if (!(o instanceof Unpaged unpaged)) {
+			return false;
+		}
+
+		return sort.equals(unpaged.sort);
+	}
+
+	@Override
+	public int hashCode() {
+		return sort.hashCode();
+	}
 }

src/test/java/org/springframework/data/domain/PageRequestUnitTests.java

@@ -58,6 +58,11 @@ class PageRequestUnitTests extends AbstractPageRequestUnitTests {
 
 		// Is not equal to instance with another sort
 		assertNotEqualsAndHashcode(request, PageRequest.of(1, 10, Direction.ASC, "foo"));
+
+		// Equaliity for unpaged
+		assertEqualsAndHashcode(Pageable.unpaged(), Pageable.unpaged(Sort.unsorted()));
+
+		assertNotEqualsAndHashcode(Pageable.unpaged(), Pageable.unpaged(Sort.by("foo")));
 	}
 
 	@Test // DATACMNS-1581