patch 8.2.2781: add() silently skips when adding to null list or blob Commit: https://github.com/vim/vim/commit/b7c21afef14bba0208f2c40d47c050a004eb2f34 Author: Bram Moolenaar <Bram@vim.org> Date: Sun Apr 18 14:12:31 2021 +0200 patch 8.2.2781: add() silently skips when adding to null list or blob Problem: Add() silently skips when adding to null list or blob. Solution: Give an error in Vim9 script. Allocate blob when it is NULL like with list and dict.

--- a/src/vim9execute.c
+++ b/src/vim9execute.c
@@ -1020,6 +1020,10 @@ allocate_if_null(typval_T *tv)
 	    if (tv->vval.v_dict == NULL)
 		(void)rettv_dict_alloc(tv);
 	    break;
+	case VAR_BLOB:
+	    if (tv->vval.v_blob == NULL)
+		(void)rettv_blob_alloc(tv);
+	    break;
 	default:
 	    break;
     }