David, Glenn, Roland, what do you think about adding a new compile
option SHOPT_KSH88COMPAT, to #ifdef obsolete or backwards
compatibility code, which is only required for ksh88, but not POSIX
sh, compatibility? This may help to shrink the size of ksh93, if
required, and better document the more arcane stunts made in the ksh93
code, and their reasons. Default is of course, SHOPT_KSH88COMPAT==1.

      ,   _                                    _   ,
     { \/`o;====-    Olga Kryzhanovska   -====;o`\/ }
.----'-/`-/     olga.kryzhanov...@gmail.com   \-`\-'----.
 `'-..-| /       http://twitter.com/fleyta     \ |-..-'`
      /\/\     Solaris/BSD//C/C++ programmer   /\/\
      `--`                                      `--`
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