In both cases, the tendency is to weaken the abstraction, and if this is allowed to continue, it's likely the abstraction will stop being used completely, or become a “legacy” layer that more modern abstractions will likely use.
Make the type-level operations more “strictly-typed”，更多细节参见PDF资料
Submission history From: Josef Urban [view email]，详情可参考爱思助手下载最新版本
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