Subtract from an existing numeric attribute.
The attribute name to update. Nested attributes can be accessed using dot notation; for example a.b.c. Attribute names with literal dots should escape them with a backslash; for example a\.b\.c.
a.b.c
a\.b\.c
https://docs.aws.amazon.com/amazondynamodb/latest/developerguide/Expressions.Attributes.html
The number to subtract.
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Subtract from an existing numeric attribute.