[collections] Should LazyMap use a Transformer instead of a Factory?

[Phil Steitz]

When a LazyMap creates a value on demand, it seems natural to use a 
Transformer that takes the key as input. In many (most?) cases, the key 
might be ignored, but it makes sense to make it available. LazyMap does 
have a protected Transformer member that it uses to create values, but 
the decorate method takes a Factory (which is converted to an 
effectively argumentless Transformer using 
TransformerUtils.asTransformer(Factory)). Why not have decorate take a 
Transformer?  This would seem to be more flexible. Am I missing something?

Phil

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