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由 Larry North 提交于
Given these <variable,value> mappings: <A,a> and <A.B,a-b>, $A.B would evaluate to $a.B, as it currently does, and ${A.B} to a-b instead of the current ${A.B}. Existing ${A.B}-like references will break (not evaluate to ${A.B}) if there actually is an A.B variable defined, which I think is very unlikely.
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