patch 8.2.0111: VAR_SPECIAL is also used for booleans

Problem:    VAR_SPECIAL is also used for booleans.
Solution:   Add VAR_BOOL for better type checking.
diff --git a/src/if_py_both.h b/src/if_py_both.h
index d816386..af4b98d 100644
--- a/src/if_py_both.h
+++ b/src/if_py_both.h
@@ -844,23 +844,24 @@
 	    }
 	}
     }
-    else if (our_tv->v_type == VAR_SPECIAL)
+    else if (our_tv->v_type == VAR_BOOL)
     {
 	if (our_tv->vval.v_number == VVAL_FALSE)
 	{
 	    ret = Py_False;
 	    Py_INCREF(ret);
 	}
-	else if (our_tv->vval.v_number == VVAL_TRUE)
+	else
 	{
 	    ret = Py_True;
 	    Py_INCREF(ret);
 	}
-	else
-	{
-	    Py_INCREF(Py_None);
-	    ret = Py_None;
-	}
+	return ret;
+    }
+    else if (our_tv->v_type == VAR_SPECIAL)
+    {
+	Py_INCREF(Py_None);
+	ret = Py_None;
 	return ret;
     }
     else if (our_tv->v_type == VAR_BLOB)
@@ -6389,6 +6390,7 @@
 	case VAR_JOB:
 	    Py_INCREF(Py_None);
 	    return Py_None;
+	case VAR_BOOL:
 	case VAR_SPECIAL:
 	    switch (tv->vval.v_number)
 	    {