I misdiagnosed the problem. Further investigation reveals that dash is handling quoting correctly, but that dash's builtin 'echo' function is converting those escape sequences. The POSIX standard for 'echo' says that behavior with backslash is implementation-defined. So there is no bug after all.
Please close this ticket, and I apologize for the noise. Norman Ramsey -- To UNSUBSCRIBE, email to debian-bugs-dist-requ...@lists.debian.org with a subject of "unsubscribe". Trouble? Contact listmas...@lists.debian.org