[issue1521] string.decode() fails on long strings

[Amaury Forgeot d'Arc]

Amaury Forgeot d'Arc added the comment:

> @bigmemtest(minsize=_2G*2+2, memuse=3)

minsize=_2G + 2 should trigger your second problem (where the size wraps
to a negative number). Then 7G is "enough" for the test to run.

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