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feat: optimise jsx runtime (#4337)

* optimise jsx-runtime by only creating a new object when ref is passed

* add test

* shave

* Update jsx-runtime/src/index.js

Co-authored-by: Jason Miller <developit@users.noreply.github.com>

* fix

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Co-authored-by: Jason Miller <developit@users.noreply.github.com>

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