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What happens is that the range operator .. is not overloadable. bigint works by overloading operators and literals, and since .. is not overloadable, it can't make bigint ranges work. And, more to the point here, the variables coming out of iterating a range are normal ints, and not bigints.

This is a known limitation, over which I've also stumbled in the past. I don't know if it's documented somewhere; if not, it really should be. Update: I've submitted a doc patch which mentions this problem in and Second Update: patch accepted, so perl 5.18 will contain the updated documentation.

In reply to Re: Strange interaction of bigint and foreach by moritz
in thread Strange interaction of bigint and foreach by Athanasius

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