Range filters: inclusive?

[Robert Brown]

Hi,

When I perform a range query of ['' TO *] to filter out docs where a 
particular field has a value, this does what I want, but I thought using 
the square brackets was inclusive, so empty-string values should 
actually be included?

The JSON I post to Solr has empty values, not null/undefined.

Am I missing something or is this a feature?

Thanks,
Rob