Library Cast function ParseFloat not working correctly

[Axou89]

The function ParseFloat(str string, bitSize int) float {} from the Cast Library doesn't cast properly the string to a float number.
For example, instead of casting the string "42.42" to the float number 42.42, it casts to 42.41999816894531.

function testParseFloat() {
    var str string = "42.42";
    var x int = 64;
    var y float = cast.parseFloat(str, x);
    console.print(y);
}
testParseFloat();

Probably an error from the casting from GoType Float to EclaType Float.