unmarshalling collection into typed arraylist does not match arraylist type

If you have a collection unmarshalling into a typed ArrayList, and the binding file doesn't give the correct type, there is no error thrown either at bind compile time or at unmarshaling time.

For example:

class Template
{
enum days

;
ArrayList<days> activeDays;
}

and binding of

<mapping name="template" class="Template">
<collection field="activeDays">
<value name="activeDays" type="java.lang.String" usage="optional"/>
</collection>
</mapping>

And an xml file of:
<template>
<activeDays>MON</activeDays>
</template>

When this is unmarshalled, the activeDays array list has one element: A string "MON". rather than the enum element MON, as expected.