Lax compose for open lax hypergraphs #21
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Context
Allow lax composition for open lax hypergraphs: graphs are composed without checking if labels match.
Motivating example
Suppose that an hypergraph represents programs where nodes are types and edges are builtin functions. During the graph construction we use type variables instead of types for some nodes whose type cannot be determined. In those case, it is convenient to compose laxly and resolve the types later by unification/substitution.