Implement a computationHandler API, with a cleanup method#4

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CaptainN wants to merge 42 commits intorisetechnologies:hooksfrom

CaptainN:hooks-cleanup-2

Commits on Jul 18, 2019

Commits on Jul 19, 2019

Commits on Jul 20, 2019

Commits on Jul 21, 2019

Use a much cleaner forceUpdate method based on useReducer
CaptainN
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Commits on Jul 22, 2019

Update to avoid running side effects in render, cause double invocation of reactiveFn on mount, possibly more with suspense
CaptainN
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Revert "Update to avoid running side effects in render, cause double invocation of reactiveFn on mount, possibly more with suspense"
CaptainN
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Make "falsy" deps check in computation consistent with other checks.
CaptainN
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Commits on Jul 23, 2019