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Type:
Improvement
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Resolution: Unresolved
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Priority:
Major - P3
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None
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Affects Version/s: None
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Component/s: None
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Query Integration
Javascript math operators don't produce useful results when applied to NumberDecimal:
> NumberDecimal(2) + 2
NumberDecimal("2.00000000000000")2
> NumberDecimal(2) - 2
NaN
This is especially confusing in server-side Javascript, like $function.
We could make it fail more helpfully by customizing the toPrimitive method (https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Symbol/toPrimitive):
> NumberDecimal.prototype[Symbol.toPrimitive] = () => { throw "Invalid..."; }
() => { throw "Invalid..."; }
> NumberDecimal(2) + 2
uncaught exception: Invalid...
> NumberDecimal(2) - 2
uncaught exception: Invalid...
toString would still work as expected, even if we customize toPrimitive:
> NumberDecimal(2) NumberDecimal("2.00000000000000") > NumberDecimal(2).toString() NumberDecimal("2.00000000000000")
But implicit coercion to string would stop working:
> NumberDecimal(2) + " items"
uncaught exception: Invalid...
> `${NumberDecimal(2)} items`
uncaught exception: Invalid...
which could be good or bad. It can reveal mistakes, but can also break tests or scripts that intentionally use this behavior.