Add type implementations for all minimally required types

@@ -60,0 +18,4 @@
+	 * @return bool `true` if the new type fits all possible values of the current type, `false` if
+	 *  not or if the new type is unknown
+	 */
+	public function fits(self $newType): bool;

@@ -0,0 +35,4 @@
+
+	#[Override]
+	public function toSql(): string {
+		throw new LogicException(