(int val)
  val: any type
  returns an int

Converts its argument to an integer.

• If the argument is already an integer, it's returned.

• If the argument is a floating-point number, the float is rounded towards zero. Values outside the representable range for a 32-bit signed integer are saturated (they return int's maximum or minimum value). nan.0 returns 0.

• If the argument is a character, returns its Unicode scalar value. This value can be passed to the char function to losslessly convert it back to a character.

• If the argument is a boolean, returns 0 for #f or 1 for #t.

• Any other argument is an error.