Let's consider the case that - the first array contains valid entries, - all entries in the second array are corrupted. Then, when we are going to upwards, and a call of generic_array_bisect() matches the last entry of the first array, then the second array was cached with last_index == UINT64_MAX, instead of the first array with its last entry. Hence, when generic_array_bisect() is called next time, the function call of test() always fail. So, the cache entry is mostly meaningless. Let's always store valid cache entry.
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