This is probably not the right fix, but it is a workaround for now...

Author: Steven Schlansker

src/main/java/com/fasterxml/jackson/module/mrbean/AbstractTypeMaterializer.java

@@ -180,7 +180,9 @@ public JavaType resolveAbstractType(DeserializationConfig config, JavaType type)
         /* We won't be handling any container types (Collections, Maps and arrays),
          * Throwables or enums.
          */
-        if (type.isContainerType() || type.isPrimitive() || type.isEnumType() || type.isThrowable()) {
+        if (type.isContainerType() || type.isPrimitive() || type.isEnumType() || type.isThrowable() ||
+                type.getRawClass() == Number.class)
+        {
             return null;
         }
         Class<?> cls = type.getRawClass();