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Matthias Krüger
45b2a711b1
Remove initialized-bytes tracking from `BorrowedBuf` and `BorrowedCursor` As discussed extensively in libs-api, the initialized-bytes tracking primarily benefits calls to `read_buf` that end up initializing the buffer and calling `read`, at the expense of calls to `read_buf` that *don't* need to initialize the buffer. Essentially, this optimizes for the past at the expense of the future. If people observe performance issues using `read_buf` (or something that calls it) with a given `Read` impl, they can fix those performance issues by implementing `read_buf` for that `Read`. Update the documentation to stop talking about initialized-but-unfilled bytes. Remove all functions that just deal with those bytes and their tracking, and remove usage of those methods. Remove `BorrowedCursor::advance` as there's no longer a safe case for advancing within initialized-but-unfilled bytes. Rename `BorrowedCursor::advance_unchecked` to `advance`. Update tests. r? ``@Amanieu``