+ * flush all standard streams before prompting in the REPL and the
+ debugger
+ * eof selects abort in the debugger
+ * minor incompatible change: *INVOKE-DEBUGGER-HOOK* is run before
+ *DEBUGGER-HOOK* => *DEBUGGER-HOOK* is not run when the debugger
+ is disabled
+ * bug fix: degree sign (<U00B0>) could not be encoded in KOI8-R.