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$ perl -e " use bignum; my $q = 123.0; print join q{ }, $_, $q->digit( +-$_),$/ for 1 .. 5 ; warn ref $q " 1 1 ... 5 0 Math::BigInt at -e line 1.
$ perl -e " use bignum; my $q = 123 + 1/3; print join q{ }, $_, $q->di +git(-$_),$/ for 1 .. 5 ; warn ref $q " Can't use an undefined value as an ARRAY reference at ...lib/Math/BigI +nt/Calc.pm line 1209.