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As previously explained, Sabela uses a managed GHCi subprocess to evaluate code snippets. This has two important advantages. Firstly, we get the power, stability, and API surface of GHCI for free. Secondly, we get GHC’s package management capabilities for free (package envs, GHC environments etc). These two advantages jointly make the package easy to maintain.，这一点在PDF资料中也有详细论述