dillon1000/react

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Fix unmounting performance regression in V8 (#7232)

As reported in #7227, unmounting performance regressed with React 15.
It seems that `delete` has become much slower since we started using numeric keys.
Forcing dictionary keys to start with a dot fixes the issue.
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Dan Abramov authored 64e7602b3b9af9a43fd2f3495d3b13a398bb94d9 Parent b6e1eb2
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M src/renderers/dom/client/eventPlugins/SimpleEventPlugin.js ModifiedM src/renderers/shared/stack/event/EventPluginHub.js Modified
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