Fixes invalid specification of significantDigits on a String with integer argument.

[modlfo]

I found a few cases inside DynamicSelect where the String() is called with an integer argument and the significantDigits are provided. That's invalid according to the specification.

The standard type coercion described in section 10.6.13 shall not be applied for the first argument of String. Hence, specifying significantDigits is an error when the first argument of String is an Integer expression.

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