fix(IOB): EOF does not overwrite last char anymore

src/io_backend/io_backend.c

@@ -99,7 +99,7 @@ ssize_t stream_read(char **stream)
         *stream = context.args;
         size_t len = strlen(context.args);
         context.args[len] = EOF;
-        return len;
+        return len + 1;
     }
     else
     {