subtype-of 和 is-a 很容易混用,但它們其實是不同的。subtype-of 是描述 type 和 type 的關係,但 is-a 是 instance 和 type 的關係。 https://twitter.com/CaiXueYong/status/1269951166630072320
https://t.me/private_channel_c14370a/4019
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