Is this the concatenation bug again?

Let's say I have three variables that represent the (numerical) results of three questions.  I'm going to call the variables Q1, Q2, and Q3.
The variable for the total result is Result
So then I do an advanced action that has:
expression: Result = Result + Q1
expression: Result = Result + Q2
expression: Result = Result + Q3
Let's say Q1 = 1, Q2 = 2, Q3 = 3
In the flash version of my project, Result = 6 as expected.
In the html5 version of my project, Result = 123.
Initialising Result with 0 rather than null doesn't have any effect.
Looks to me like the flash version is treating the variable Result as a number, while html5 is treating it as a string.
It seems to me that the fact that variable types aren't declared in Captivate gives all kinds of problems.  Captivate is taking a stab at the variable type and getting it wrong.  Why can't we just declare variable type when we're initialising like you would in "proper" programming?
(As well as having a whinge, if anybody has a workaround I'd be extremely grateful.)

The team in Bangalore sent me a new radio button widget that correctly treats numerical values as such, and not as strings.

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