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As an example, 'print(string.format("%.99f", 1e70))' may have a
lot of garbage after the number.
The old test to ensure that 'string.format("%.99f", n)' was not too
large, 'fabs(n) < 1e100', assumes that the number will fit in the 99
bytes; but the 99 is not the space for the number, it is the added
extra zeros. The option worked for smaller numbers because of the
extra space added to MAX_ITEM.