When creating a Set of BasicEdges, the Hashcode function is used to determine
map keys for the underlying set data structure.
The string hex representation of the two vertices' pointers is unsafe to use
as a map key, since these addresses may change between the time they are added
to the set and the time the set is operated on.
Instead we modify the Hashcode function to maintain the references to the
underlying vertices so they cannot be garbage collected during the lifetime
of the Set.
This is part of a general effort to move all of Terraform's non-library
package surface under internal in order to reinforce that these are for
internal use within Terraform only.
If you were previously importing packages under this prefix into an
external codebase, you could pin to an earlier release tag as an interim
solution until you've make a plan to achieve the same functionality some
other way.
Katy Moe