Lazy Context Propagation & useContextSelector hook #3
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Will end up breaking into separate RFCs and PRs
For now
Lazy Propagation Algorithm: attempts to take advantage of already scheduled work to avoid walking the fiber tree except when necessary (on bailouts that don't go deeper for work on children)
useContextSelector hook: adds a hook that is a modified context reader. it will only schedule work on it's host fiber when the selector value has changed. This hook is intended to be used with the new propagation scheme because it otherwise has numerous problems with selectors running too often / too early.