Magento Email Template If Statements

The Magento Email Template If Statements aren't evaluating to true when I expect them to. Can someone tell me what's wrong? Take a look at the following code:

{{var customer.group_id}}
{{if customer.group_id}}Print true{{else}}Print false{{/if}}
{{if customer.group_id==4}}Print true{{else}}Print false{{/if}}
{{if customer.group_id=4}}Print true{{else}}Print false{{/if}}
{{if customer.group_id eq 4}}Print true{{else}}Print false{{/if}}

The output is

4
Print True
Print False
Print False
Print False

I tried putting quotes around the 4, but same result. How do I evaluate equalities with magento email template if statements?