First, thank you for this great module, it is extremely useful. Hopefully I'm not being dense, but I can't seem to figure out how to set the "Email Opt Out" field in Salesforce using this module. I know I can set the field through the API since I've done it with a standalone php script while I was testing. From those tests, I know that Salesforce wants the value set to "true" to check the box.

I have tried multiple ways: setting up a checkbox with a single value of "true", radio buttons with true/false, and select list with true/false. None of them seem to be passing the "true" value to Salesforce. (I've also tried passing it 1/0 and yes/no for good measure. Nothing seems to work)

I searched the docs & the issue queue and I can't seem to find anything on this topic. Are checkboxes supported? Should they work and I'm just doing it wrong?

Any info is appreciated.
- Dan