Case insensitive but number sensitive string?

[Jon Drukman]

I want a string field that is case insensitive.  This is what I tried:

 <fieldType name="cistring" class="solr.StrField" sortMissingLast="true"
omitNorms="true">
        <analyzer type="index">
                <tokenizer class="solr.LowerCaseTokenizerFactory"/>
        </analyzer>
        <analyzer type="query">
                <tokenizer class="solr.LowerCaseTokenizerFactory"/>
        </analyzer>
    </fieldType>


However, it is matching "opengl" for "opengl128".  I want exact string matches,
but I want them case-insensitive.  What did I do wrong?