Struct wrapping NamedTuple is not `isbits` (depending on how it is defined)

General Usage
,
9

Yeah, definitely looks like a bug to me:

julia> nt(::Wrapper{S,T}) where {S,T} = NamedTuple{S,T}
nt (generic function with 1 method)

julia> nt(X)
NamedTuple{(:a, :b, :c, :d), Tuple{Float64, Float64, Int64, SVector{3, Float64}}}

julia> nt(X) === typeof(X.x)
true

julia> isbits(X)   # false
false

julia> isbits(X.x)   # true
true

The wrapper seems to be matching the NamedTuple exactly.

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