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Let's improve memory allocation for call such as strv_extend() that just one item to an strv: these are often called in a loop, where they used to be very ineffecient, since we'd allocate byte-exact space. With this change let's improve on that, by allocating exponentially by rounding up to the next exponent of 2. This way we get GREEDY_REALLOC()-like behaviour without passing around state. In fact this should be good enough so that we could replace existing loops around GREEDY_REALLOC() for strv build-up with plain strv_extend() and get similar behaviour.
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