@SuppressWarnings( "unchecked" )
    public List<String> getValues() {
        if( value == null ) {
            return Collections.emptyList();
        }
        if( value instanceof String ) {
            return Lists.newArrayList( (String) value );
        }
        return (List<String>) value;
    }
Whether the tag should appear in the navigation part of the report
<p>
Is either {@code true} or {@code null}
jgiven-core/src/main/java/com/tngtech/jgiven/report/model/Tag.java