Named tuples - construction, unpacking

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You can create named tuple by naming none of the elements, by using a semicolon:

julia> a, b, c = 1, 2, 3
(1, 2, 3)

julia> (a,b)
(1, 2)

julia> (;a, b)
(a = 1, b = 2)

This is documented in ?NamedTuple.