Conversion of properties of a NamedTuple or struct

General Usage Performance
2

There may be room to optimize further, but I get a pretty big pickup specializing just on the names of the NamedTuple

# original implementation
julia> @btime cvt($state)
  2.078 μs (38 allocations: 2.31 KiB)

cvt(a::NamedTuple{N, T}) where {N, T} = NamedTuple{N}(cvt.(values(a)))

julia> @btime cvt($state)
  126.710 ns (5 allocations: 352 bytes)
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