• Support io errors with arbitrary payloads in "alloc" mode #11
• Implement Write for Cursor<Vec<u8>> #10
• Restore io::ErrorKind::Unsupported, add io::ErrorKind::OutOfMemory #8
• Use core::error, bump MSRV to 1.81 #9

Thanks @sunfishcode for his contributions!

• Fix Write impl for alloc::Vec