5.5.13  Read multiple numbers from a string

    eval:  sscanf "1,3,12.3" "%d,%d,%f";

    THE [INT 1, INT 3, FLOAT 12.3]

    eval:  scanf::sscanf "1,3,12.3" "%d,%d,%f";

    THE [INT 1, INT 3, FLOAT 12.3]