patch 8.2.1980: Vim9: some tests are not done at the script level

Problem:    Vim9: some tests are not done at the script level.
Solution:   Use CheckDefAndScriptSuccess() in more places.  Fix uncovered
            problems.

Author: brammool

src/eval.c

@@ -3438,7 +3438,15 @@ eval7_leader(
 		}
 #ifdef FEAT_FLOAT
 		if (rettv->v_type == VAR_FLOAT)
-		    f = !f;
+		{
+		    if (in_vim9script())
+		    {
+			rettv->v_type = VAR_BOOL;
+			val = f == 0.0 ? VVAL_TRUE : VVAL_FALSE;
+		    }
+		    else
+			f = !f;
+		}
 		else
 #endif
 		{

src/list.c

@@ -1264,7 +1264,7 @@ eval_list(char_u **arg, typval_T *rettv, evalarg_T *evalarg, int do_error)
 	had_comma = **arg == ',';
 	if (had_comma)
 	{
-	    if (vim9script && !IS_WHITE_OR_NUL((*arg)[1]))
+	    if (vim9script && !IS_WHITE_OR_NUL((*arg)[1]) && (*arg)[1] != ']')
 	    {
 		semsg(_(e_white_space_required_after_str), ",");
 		goto failret;

src/scriptfile.c

@@ -1332,7 +1332,10 @@ do_source(
 	// set again.
 	ht = &SCRIPT_VARS(sid);
 	if (is_vim9)
+	{
 	    hashtab_free_contents(ht);
+	    hash_init(ht);
+	}
 	else
 	{
 	    int		todo = (int)ht->ht_used;