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> Does the integer representation require something special to use, or is
> used automatically for any number that happens to be an integer?

The lexer decides which type of number a numeric value is.
So 123 is an integer and 123.0 is a real.

All operations on values of the same type give values of that type,
except that division always gives a real. There is a new integer
division operation, denoted by //.

So 13/4 gives 3.25 and 13//4 gives 3. Also, 12/4 gives 3.0 and 12//4 gives 3.

> Also, does the integer support need any special build-time flag/option
> to enable?

No. And it cannot be disabled either.