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Matthias Krüger
d8e9ddc843
fix #120603 by adding a check in default_read_buf Fixes #120603 by checking the returned read n is in-bounds of the cursor. Interestingly, I noticed that `BorrowedBuf` side-steps this issue by using checked accesses. Maybe this can be switched to unchecked to mirror what BufReader does https://github.com/rust-lang/rust/blob/bf3c6c5bed498f41ad815641319a1ad9bcecb8e8/library/core/src/io/borrowed_buf.rs#L95