SYNOPSIS
        int to_int(string)
        int to_int(float)
        int to_int(int)
        int to_int(closure)

        (int)<value>

DESCRIPTION
        Floats are truncated to integer values, strings with leadings
        digits are converted to integers up to the first non-digit.
        lfun-closures are converted into their function index,
        variable closure are converted into their variable index.
        Integers are just returned.

        Regarding floats, it is important to keep rounding effects
        in mind: to_int(3.1*10.0) does not return 31, but instead 30,
        because internally the result of the multiplication is 30.999999 .

HISTORY
        Introduced in 3.2.1@2

SEE ALSO
        to_string(E), sscanf(E)