Here is one way to do it:
my $precision = 8;
for (0..20)
{
my $var = int(rand($precision));
print $var/($precision-1), "\n";
}
Even if the output of rand is not an int, it still is one value among a list of possible ones. Here that fact is explicit rather than implicit, and you get to chose the size of that list.
Maybe Crypt::Random would be a better fit, since you provide a length in bits for the random number, you just have to map 0 to 0, and ~0 to 1 (ie, divide the big unsigned int by the max value).
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