That's tricky: for a number that doesn't fit in UV (integer), Perl automatically stores it in NV (double) which can result in an immediate loss of precision.

See also $Config{nv_overflows_integers_at}:

$ uname -p
x86_64
$ perl -MConfig -le 'print eval $Config{nv_overflows_integers_at}'
9007199254740992

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In reply to Re^2: Number too big to fit in integer by haukex
in thread Number too big to fit in integer by jpl

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