Update object-into-string adapter.

src/main/java/com/rezzedup/util/valuables/Adapts.java

@@ -38,15 +38,24 @@ public class Adapts
 
     /**
      * Gets standard adapters for serialized strings.
-     * Strings will be parsed for deserialized values.
+     * <p>Strings will be parsed into deserialized values.</p>
      *
      * @return  adapters for strings
      */
     public static Adapter.StandardSet<String> string() { return STRINGS; }
 
     /**
      * Gets standard adapters for casting objects.
-     * Objects will be cast for deserialized values.
+     *
+     * <p>Objects will be cast into deserialized values,
+     * with a few exceptions:</p>
+     *
+     * <ul>
+     *     <li>{@code intoString()} converts objects into
+     *     their string representation.</li>
+     *     <li>All number types are compatible with each
+     *     other since they all extend {@code Number}.</li>
+     * </ul>
      *
      * @return  adapters for objects
      */
@@ -152,7 +161,7 @@ public <E extends Enum<E>> Adapter<String, E> intoEnum(Class<E> type)
 
     private static class StandardObjectAdapters implements Adapter.StandardSet<Object>
     {
-        static final Adapter<Object, String> STRING = Adapter.cast(o -> o instanceof String);
+        static final Adapter<Object, String> STRING = Adapter.of(o -> Optional.of(String.valueOf(o)), Optional::of);
 
         static final Adapter<Object, Boolean> BOOLEAN = Adapter.cast(o -> o instanceof Boolean);