ChainRules.jl
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Use ProjectTo in multiarg +
I believe the reshape(..., axes(a)) was basically a early stand before we had the more fully features ProjectTo code.
Came up when reviewing https://github.com/JuliaDiff/ChainRules.jl/pull/782
Duplicate of https://github.com/JuliaDiff/ChainRules.jl/pull/578 . That one has some evil tests, which should perhaps be copied here... do they now pass?