static void vvalue_strbuf_append_blob(wmem_strbuf_t *strbuf, void *ptr)
{
	struct data_blob *blob = (struct data_blob*)ptr;
	wmem_strbuf_append_printf(strbuf, "size: %d", (int)blob->size);
}
static void vvalue_strbuf_append_blob(wmem_strbuf_t *strbuf, void *ptr)
{
	struct data_blob *blob = (struct data_blob*)ptr;
	wmem_strbuf_append_printf(strbuf, "size: %d", (int)blob->size);
}