change expansion for key-value pair compound assignment to associative arrays to split all words before identifying keys and values; controlled by a new shopt option: kvpair_split, enabled by default; new `loadassoc' loadable builtin to load an associative array from a set of key-value arguments

builtins/printf.def

@@ -45,8 +45,12 @@ in printf(3), printf interprets:
   %(fmt)T	output the date-time string resulting from using FMT as a format
 	        string for strftime(3)
 
+Like printf(3), printf can reference arguments in non-sequential order.
+A format specifier %N$, where N is a decimal integer greater than 0,
+refers to the Nth argument supplied to printf.
+
 The format is re-used as necessary to consume all of the arguments.  If
-there are fewer arguments than the format requires,  extra format
+there are fewer arguments than the format requires, extra format
 specifications behave as if a zero value or null string, as appropriate,
 had been supplied.
 

builtins/shopt.def

@@ -123,6 +123,7 @@ extern int debugging_mode;
 #if defined (ARRAY_VARS)
 extern int array_expand_once;
 int expand_once_flag;
+extern int kvpair_split_assignments;
 #endif
 
 #if defined (SYSLOG_HISTORY)
@@ -235,6 +236,9 @@ static struct {
   { "huponexit", &hup_on_exit, (shopt_set_func_t *)NULL },
   { "inherit_errexit", &inherit_errexit, (shopt_set_func_t *)NULL },
   { "interactive_comments", &interactive_comments, set_shellopts_after_change },
+#if defined (ARRAY_VARS)
+  { "kvpair_split", &split_kvpair_assignments, (shopt_set_func_t *)NULL },
+#endif
   { "lastpipe", &lastpipe_opt, (shopt_set_func_t *)NULL },
 #if defined (HISTORY)
   { "lithist", &literal_history, (shopt_set_func_t *)NULL },