建造中的船舶保险合同，是指保险人按照约定，对被保险人在船厂建造、试航和交船过程中的船舶遭受海上保险事故造成的损失和产生的责任负责赔偿，而由被保险人支付保险费的合同。
Before diving into implementation details you can simulate how Sabela works in GHCi yourself. Doing so will help you get a better intuition of the library’s design choices.
，这一点在91视频中也有详细论述
│ │ Gofer │ ◄── FILE I/O PROXY
Original OSM: ~2.07 billion points, ~2.42 billion edges
Data compression in MongoDB, enabled by default: https://www.mongodb.com/docs/manual/core/wiredtiger/#compression