After getting annoyed with debian using dash as /bin/sh. Adding features is one understandable thing affecting portability but surely you can keep it backward compatible. I came across this description and wondered what the lists thoughts would be.
"http://packages.debian.org/squeeze/mksh"; "mksh is the only pdksh derivate currently being actively developed. It includes bug fixes and feature improvements, in order to produce a modern, robust shell good for interactive and especially script use. mksh has UTF-8 support (in substring operations and the Emacs editing mode) and, while R39c corresponds to OpenBSD 4.6-current ksh (without GNU bash-like PS1 and fancy character classes), adheres to SUSv4 and is much more robust."
