The 9,000-pound monster I don’t want to give back
unbound type variables and let them be generalized:
，这一点在快连下载安装中也有详细论述
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stack.push(cur);
Idempotence: merging a state with itself doesn’t change the state; A ∨ A = A. If Alice merges her own state with itself, the result will be the same state she started with.