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Set the locale according to how you want to interpret values as numbers. For example, if locale is set to US or UK then "123.45" is a number and "123,45" isn't, and vice versa if locale is Germany or France.
An integer is a whole number. E.g. "1.0" or "1,0" (depending on your locale), "0", "-1" and "1e3" are considered integers.
You can change the format of numbers using the Num Format transform.
You can change the base of integers using the Num Base transform.