In the same way that numbers in quotes will be interpreted as numeric values when used in logical calculations, numeric values will be interpreted as strings when included in string-based functions.
For example:
StrLen(4329) = 4;
Concat( "User", ( 4 * 4 ) ) = "User16";
SubStr( 123456789, 3, 4 ) = "4567";
Because of this, you do not need to put a numeric value in quotes when you want to analyse it as a string.
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