How do you output the value of a checkbox item? Seems like it should be simple but it's not working for me.

{% for option in entry.contributionType %}
     &lt;li&gt; {{ option.value }} &lt;/li&gt;
{% endfor %}


This code outputs the option's label instead of  the value. I feel like I'm going crazy.
Ok, just figured it out. Apparently, when I changed the value of the fields in the settings I had to re-save all entries that used that field. And not just re-save them, but reset the value in the field as well, because it had lost it's checked value when I opened the entry up to edit it. 

I see now the warning in the field settings I had previously overlooked, "Changing this may result in data loss."