Skip typechecking when the decls have not changed #159
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This will run the typechecker once on the changed file to detect if the returned list of declarations is the same as the cached one. Typechecking for other modules will be skipped if the returned declarations have not changed.
A current limitation is that this will repeat the typechecking for the changed file if it is detected that the declarations are different. It should be straightforward to fix this.