From 71171bc04cdecbb22696b83be079a0b163f4ac54 Mon Sep 17 00:00:00 2001
From: John Kerl <kerl.john.r@gmail.com>
Date: Sat, 26 Aug 2023 23:41:50 -0400
Subject: [PATCH] Treat empty like absent in `+` `-` `*` (#1371)

* empty plus value is value

* unit-test cases

* make-docs output

* docs files

* on-line table for null-handling arithmetic rules

* doc mods