- Changed all the `goto &Math::*` calls to regular function calls.
- Changed all the `goto &Math::*` calls to regular function calls.

This may prevent some memory leaks in some special cases.

One such example, is the following, which used over 500 MB of RAM:

    use Sidef;

    my $n = Sidef::Types::Number::Number->new(0);
    my $d = Sidef::Types::Number::Number->new(6);

    my $digits = $d x $d;
    foreach my $k (1..1e6) {
        push @list, $n if index($n->inc->pow($d)->mul($d), $digits) >= 0
    }

Now, the above code requires only 25 MB of RAM.

trizen/sidef,trizen/sidef,trizen/sidef,trizen/sidef