A #GSequenceIterCompareFunc is a function used to compare iterators. It must return zero if the iterators compare equal, a negative value if a comes before b, and a positive value if b comes before a.
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a #GSequenceIter
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A #GSequenceIterCompareFunc is a function used to compare iterators. It must return zero if the iterators compare equal, a negative value if
acomes beforeb,and a positive value ifbcomes beforea.