Wrong return value in @spec for Graph.in_edges().

[dendrown]

Hello. As I understand from the documentation, Graph.in_edges() is supposed to return "a list of Graph.Edge". However, the @spec declares that only one edge is returned.

@spec in_edges(t, vertex) :: Edge.t()

This is causing Dialyzer some discomfort:

Line 1193 Column 9: The pattern [Edge] can never match the type #{'__struct__':='Elixir.Graph.Edge', 'label':=_, 'v1':=_, 'v2':=_, 'weight':=number()}
Line 1194 Column 9: The pattern [Edge | More] can never match the type #{'__struct__':='Elixir.Graph.Edge', 'label':=_, 'v1':=_, 'v2':=_, 'weight':=number()}

Note that I'm using libgraph from an Erlang module, but of course, that shouldn't matter. I'm using version 0.16.0 of the library.

[dendrown]

I just noticed the same issue exists for out_edges/2.