[REACT] Bug: Uncontrolled `<input />` element has value attribute removed

[tidyline]

원본 이슈: facebook/react#32576

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React version: React 19

Steps To Reproduce

1. Pass an value={undefined} as a prop to an <input /> element
2. Observe the DOM and see the value attribute is absent

Link to code example:

React 18

React 19

The current behavior

React 18 passed a booleanish attribute i.e. <input value />. React 19 omitted the attribute altogether i.e. <input />. This is causing a lot of failures in our snapshot tests. I'm not sure if this behaviour is expected in React 19 and I can't find anything in the release notes apart from this loosely related PR. If this behaviour is expected in 19, it would be great to mention that somewhere!