NamedTuples with constant type

General Usage
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2

You would have to add another type parameter and define your own inner constructor, if you don’t always want to have to specify the third parameter, e.g.:

struct Foo{S,T,N}
    val::NamedTuple{S,NTuple{N,T}}
    function Foo{S,T}(val::NamedTuple{S,NTuple{N,T}}) where {S,T,N}
        return new{S,T,N}(val)
    end
end

It doesn’t make much sense here to restrict S, since that’s already handled by the NamedTuple constructor. You could however always check this in the constructor.

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