* enhancement: SB-POSIX improvements:
** WNOHANG and WUNTRACED are exported.
** SYSCALL-ERROR now also provides the name of the failing system call.
+ * enhancement: --script improvements:
+ ** errors on standard input, output, and error streams are handled and
+ cause scripts to exit silently, making them easier to use in shell
+ pipelines.
+ ** backtraces from scripts now go to standard error instead of the
+ terminal even if one is available.
+ ** --script can be an argument, causing the script to be loaded from
+ standard input.
* optimization: using a &REST argument only in APPLY or VALUES-LIST calls
allows the compiler to automatically elide rest-list allocation so long as
the call sites are in functions that the compiler knows cannot escape.