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ba9fa89bfb
The default buffer size is the same as the one in Java's BufferedWriter. We may want BufferedWriter to have a Drop impl that flushes, but that isn't possible right now due to #4252/#4430. This would be a bit awkward due to the possibility of the inner flush failing. For what it's worth, Java's BufferedReader doesn't have a flushing finalizer, but that may just be because Java's finalizer support is awful. The current implementation of BufferedStream is weird in my opinion, but it's what the discussion in #8953 settled on. I wrote a custom copy function since vec::copy_from doesn't optimize as well as I would like. Closes #8953