Routinely hitting errors of the following form where the types should be compatible, but
xsltc is claiming they aren't.

ERROR: 'Error checking type of the expression 'funcall(matches, [literal-expr(aba), literal-expr(a)])'.'
FATAL ERROR: 'Could not compile stylesheet'

javax.xml.transform.TransformerConfigurationException: Could not compile stylesheet
at com.sun.org.apache.xalan.internal.xsltc.trax.TransformerFactoryImpl.newTemplates(TransformerFactoryImpl.java:824)
at com.sun.org.apache.xalan.internal.xsltc.trax.TransformerFactoryImpl.newTransformer(TransformerFactoryImpl.java:619)