Is there something different I need to do to handle negative numbers in if statements?

I'm coming across a weird issue. I've got an eval statement calculating [var:firstnumber][var:operator][var:secondnumber] where firstnumber and secondnumber are both integers and operation is either + or -.

By using an alert, I can see what the numerical output of the eval statement is, and it's always correct. However, I have code like this:


<if lhs="[var:answer]" operator="e" rhs="4">
<assign property="object:ANSWER.text" value="four" />
</if>
<if lhs="[var:answer]" operator="e" rhs="-4">
<assign property="object:ANSWER.text" value="negative four" />
</if>


What's weird is that the wire puts "four" as the text value in the first instance, but doesn't put "negative four" in the second. In either instance, the alert box showing [var:answer] will show the correct answer: 4 or -4 depending on the situation.