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3ac0eb075d
If a JSX element has both a children prop and children (ie. <div children={childOne}>{childTwo}</div>), IE throws an Multiple definitions of a property not allowed in strict mode. This modifies the previous fix (which used an Object.assign) by making the duplicate children a sequence expression on the next prop/child instead so that ordering is preserved. For example:
```
<Component children={useA()} foo={useB()} children={useC()}>{useD()}</Component>
```
should compile to
```
React.jsx(Component, {foo: (useA(), useB()), children: (useC(), useD)})
```