Filter Sprout Forms entries based on field value, using parameters I'm trying to display form entries from Sprout Forms that match a specific criterium:

{% for formEntry in craft.sproutForms.entries.formHandle('formHandle').fieldname('fieldvalue') %}
    {{formEntry.fieldname}}
{% endfor %} 


This does not filter the entries.

This works:

{% for formEntry in craft.sproutForms.entries.formHandle('formHandle') %}
    {% if fieldname == 'fieldvalue'%}
        {{formEntry.fieldname}}
    {% endif %} 
{% endfor %} 


Can this not be done with parameters, or am I using the wrong Entry model?
Filtering entries is now possible as of Sprout Forms v2.2.0:

{% for formEntry in craft.sproutForms.entries.formHandle('contact').firstName('Zoe') %}
  ...
{% endfor %#}