diff --git a/src/eval.c b/src/eval.c
index b1fad1d..abdf076 100644
--- a/src/eval.c
+++ b/src/eval.c
@@ -3222,12 +3222,14 @@
 		{
 		    rettv->v_type = VAR_BOOL;
 		    rettv->vval.v_number = VVAL_TRUE;
+		    ret = OK;
 		}
 		else if (len == 5 && in_vim9script()
 						&& STRNCMP(s, "false", 4) == 0)
 		{
 		    rettv->v_type = VAR_BOOL;
 		    rettv->vval.v_number = VVAL_FALSE;
+		    ret = OK;
 		}
 		else
 		    ret = eval_variable(s, len, rettv, NULL, TRUE, FALSE);
@@ -3271,6 +3273,7 @@
     int		ret = OK;
     int		error = FALSE;
     varnumber_T val = 0;
+    vartype_T	type = rettv->v_type;
 #ifdef FEAT_FLOAT
     float_T	    f = 0.0;
 
@@ -3301,7 +3304,10 @@
 		    f = !f;
 		else
 #endif
+		{
 		    val = !val;
+		    type = VAR_BOOL;
+		}
 	    }
 	    else if (*end_leader == '-')
 	    {
@@ -3310,7 +3316,10 @@
 		    f = -f;
 		else
 #endif
+		{
 		    val = -val;
+		    type = VAR_NUMBER;
+		}
 	    }
 	}
 #ifdef FEAT_FLOAT
@@ -3323,7 +3332,10 @@
 #endif
 	{
 	    clear_tv(rettv);
-	    rettv->v_type = VAR_NUMBER;
+	    if (in_vim9script())
+		rettv->v_type = type;
+	    else
+		rettv->v_type = VAR_NUMBER;
 	    rettv->vval.v_number = val;
 	}
     }
diff --git a/src/testdir/test_vim9_expr.vim b/src/testdir/test_vim9_expr.vim
index 0af5402..aa59973 100644
--- a/src/testdir/test_vim9_expr.vim
+++ b/src/testdir/test_vim9_expr.vim
@@ -1313,6 +1313,16 @@
   assert_equal(g:special_false, false)
   assert_equal(g:special_true, v:true)
   assert_equal(g:special_false, v:false)
+
+  assert_equal(true, !false)
+  assert_equal(false, !true)
+  assert_equal(true, !0)
+  assert_equal(false, !1)
+  assert_equal(false, !!false)
+  assert_equal(true, !!true)
+  assert_equal(false, !!0)
+  assert_equal(true, !!1)
+
   assert_equal(g:special_null, v:null)
   assert_equal(g:special_none, v:none)
 
@@ -1332,6 +1342,14 @@
       assert_equal(true, t)
       assert_equal(v:false, false)
       assert_equal(false, f)
+      assert_equal(true, !false)
+      assert_equal(false, !true)
+      assert_equal(true, !0)
+      assert_equal(false, !1)
+      assert_equal(false, !!false)
+      assert_equal(true, !!true)
+      assert_equal(false, !!0)
+      assert_equal(true, !!1)
   END
   CheckScriptSuccess(lines)
 enddef
diff --git a/src/version.c b/src/version.c
index 64eca6b..4d86275 100644
--- a/src/version.c
+++ b/src/version.c
@@ -755,6 +755,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    1412,
+/**/
     1411,
 /**/
     1410,