Some minor touchup to preconditions and fix for minus. #104
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Proposed changes
Forgo negating an expression for the ability to subtract two expressions.
Fixes
Fixes #100, but also breaks the use of
-
as something that negates.Types of changes
What types of changes does your code introduce?
Put an
x
in the boxes that applyChecklist
Put an
x
in the boxes that apply.Further comments
More discussion over in #100