Need to half a value but don't want fractions. So how can I make this command...

squiffy.set("num",squiffy.get("num")/2);

...return whole numbers (rounded down, I suppose).

You can use Math.round(x) for the nearest whole number, or round down with Math.floor(x).
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@set health = 91

    var H = squiffy.get("health")/2;
    squiffy.set("health", Math.round(H));
    
Your Health is now at {health}.

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That's what I needed. Many thanks!