• Duration literals: 500ms, 1h30m.
• Mutable Bytes with binary read/write helpers.
• Result.fail, improved type inference, clearer diagnostics, and runtime fixes.

Breaking changes: Bytes now shares mutations by reference. HTTP request/response .body is replaced by Http.text(r). Cmd.Output drops stdoutBytes and stderrBytes; use Cmd.captureBytes for binary stdout.

Full changelog