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We recently made TaskExecutor public. It currently exposes two methods: one to create tasks given a collection of callables, and one to execute all tasks created at step 1. We can rather expose a single public method that takes a collection of callables which internally creates the appropriate tasks. This simplifies the API, and stops us from leaking the internal Task abstraction which can be kept private.
Note that this is backwards compatible as we have not released yet a version where the TaskExecutor was made public. It is marked experimental anyways.