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b48badc3b6
Previously, FlacLoader would read the data for each frame into a separate vector, which are then combined via extend() in the end. This incurs an avoidable copy per frame. By having the next_frame() function write into a given Span, there's only one vector allocated per call to get_more_samples(). This increases performance by at least 100% realtime, as measured by abench, from about 1200%-1300% to (usually) 1400% on complex test files.