Hey, thanks for filling in. So basically a facade over the original object only masking some fields.. yeah, not really my cup of tea personally, I'm fine with

Hey, thanks for filling in. So basically a facade over the original object only masking some fields.. yeah, not really my cup of tea personally, I'm fine with approx the same amount of code for a boring builder and/or constructor call to duplicate an object, or, if appropriate, a mutable object. But it's definitely nifty.