double-quoted sudoOption values in LDAP sudoers

Hello,
I'm trying to figure out whether double-quoted values in a sudoOption 
entry in LDAP sudoers are supported. Reading the manpage, it seems they 
should be. However, when reading the code that handles sudoOptions in 
plugins/sudoers/ldap.c (and sssd.c), I don't see any double-quote 
handling in there:

/* check for equals sign past first char */
val = strchr(var, '=');
if (val > var) {
     *val++ = '\0';	/* split on = and truncate var */
     op = *(val - 2);	/* peek for += or -= cases */
     if (op == '+' || op == '-') {
	*(val - 2) = '\0';	/* found, remove extra char */
	/* case var+=val or var-=val */
	set_default(var, val, (int) op);
     } else {
	/* case var=val */
	set_default(var, val, true);
     }
} else if (*var == '!') {
     /* case !var Boolean False */
     set_default(var + 1, NULL, false);
} else {
     /* case var Boolean True */
     set_default(var, NULL, true);
}

When processing an option, e.g. env_keep="FOO BAR", set_default is 
called with: set_default('env_keep', '"FOO BAR"').

Am I missing something here or is there a bug either in the docs or in 
the code?

Thanks,
Dan K.
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