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
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John Kerl 2023-08-26 23:41:50 -04:00 committed by GitHub
parent c7b4ed59d0
commit 71171bc04c
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