Just use magical increment. 
use bignum;
my $x = 2**1024;

for ("A$x" .. "A${\($x+2)}") {
    say substr $_, 1;
}

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In reply to Re: big integers forcing me to be a C programmer: "range iterator outside integer range" by JavaFan
in thread big integers forcing me to be a C programmer: "range iterator outside integer range" by Boldra

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