The handler module is the coordination layer between the UI and the Haskell runtime. It automatically re-executes code blocks when inter-cell dependencies change thus ensuring that the notebook state remains consistent. Put simply when a cell is changed we need to update all its dependencies. Cell A depends on cell B if A uses anything that b defines. The handler module runs a series of steps to make this possible.
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that adopting some of the syntactic cleanup ideas discussed above (but