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A layer with a negative time stretch was skipped by the mix. It now plays its audio reversed at its stretched speed, through the same linear resampler as forward stretch: a reversed read starts at the layer time of the run's end and is played last to first, so comp sample k plays the source just before layer_time(k) (at -100 % with the start at the out point, the exact mirror Backwards gives a forward layer). Backwards on a reversed layer plays it forwards. Resampled runs start at the exact source position (from the layer time in ticks) instead of the grid sample a block starts on, so mixing in frame blocks and in export's one-second blocks gives the same samples, and they read one more source sample so a block's last sample blends instead of holding. Audio effects run on comp time since the layer's start, which joins up across blocks at any stretch and equals the layer time at 100 %. Reads are made in pieces of at most MAX_READ source frames, so memory stays bounded for fast layers and nested fast precomps (the work for nested 1 % precomps is not bounded; follow-up). A stretch faster than 1 % is silent as a last-resort guard, with a tolerance so exactly 1 % plays. A zero or non-finite stretch is skipped. Fixes #3239