Turns out that hex will actually use floating point numbers if required. The warning doesn't indicate outright failure as Isuspected; it indicate a potentional loss of precision. But it you're numbers are no more than 53 bits in size, there is no problem and you can silence the warning.

In reply to Re^2: Hex to decimal resulting in integer overflow by ikegami
in thread Hex to decimal resulting in integer overflow by Anonymous Monk

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