Neither did I

I only tried it after seeing this in the documentation:

Examples for converting:

  my $x = Math::BigInt->new('0b1'.'01' x 123);
  print "bin: ",$x->as_bin()," hex:",$x->as_hex()," dec: ",$x,"\n";
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Kwyjibo. A big, dumb, balding North American ape. With no chin.