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But before I delve into my latest proposal, I want to briefly discuss a key difference between my previous model and this one:
-"Types as Contracts" was a fully "validity"-based model, while "Stacked Borrows" is (to some extend) "access"-based.
+"Types as Contracts" was a fully "validity"-based model, while "Stacked Borrows" is (to some extent) "access"-based.
## 1 Validity-based vs. Access-based