BlockStub
are a special form of blocks that provide a particular reference to its "parent" block. These references can set, get, or increment the value of its "parent" block. References may also get the value for a particular agent. Finally, for a procedure block, its reference is a call block, which executes the procedure. The parent instance for a set of stubs is not permanent. The parent intance may change if the original parent it removed and then a new one with the same parent name is added to the block canvas. BlockStub manages the mapping between stubs and their parent.
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