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`delete` causes an object (in V8, and maybe other engines) to deopt to a dictionary instead of a class. Instead of `assign` + `delete`, manually iterate over all the properties, like the JSX runtime does. To avoid copying the object twice I moved the `ref` prop removal to come before handling default props. If we already cloned the props to remove `ref`, then we can skip cloning again to handle default props.
react-server
This is an experimental package for creating custom React streaming server renderers.
Its API is not as stable as that of React, React Native, or React DOM, and does not follow the common versioning scheme.
Use it at your own risk.