patch 9.1.2122: Vim9: Negating a float doesn't result in a bool

Problem:  Vim9: Negating a float doesn't result in a boolean
          (kennypete)
Solution: Make it return a boolean (Yegappan Lakshmanan).

related: #19282
related: #19289

Signed-off-by: Yegappan Lakshmanan <yegappan@yahoo.com>
Signed-off-by: Christian Brabandt <cb@256bit.org>

src/eval.c

@@ -5421,6 +5421,7 @@ eval9_leader(
 		    {
 			rettv->v_type = VAR_BOOL;
 			val = f == 0.0 ? VVAL_TRUE : VVAL_FALSE;
+			type = VAR_BOOL;
 		    }
 		    else
 			f = !f;

src/testdir/test_vim9_expr.vim

@@ -4117,6 +4117,11 @@ def Test_expr9_not()
 
       assert_equal(false, ![1, 2, 3]->reverse())
       assert_equal(true, ![]->reverse())
+
+      # float
+      assert_equal(true, !0.0)
+      assert_equal(false, !1.0)
+      assert_equal(false, !25.678)
   END
   v9.CheckDefAndScriptSuccess(lines)
 enddef

src/version.c

@@ -734,6 +734,8 @@ static char *(features[]) =
 
 static int included_patches[] =
 {   /* Add new patch number below this line */
+/**/
+    2122,
 /**/
     2121,
 /**/