Use stricter equality check

[OnlyWick]

In Fiber node, the default value of stateNode is null, so it's better to use === directly for comparison(Additionally, it avoids implicit type conversion)

react/packages/react-reconciler/src/ReactFiber.js

Line 152 in 152bfe3

this.stateNode = null;

[react-sizebot]

Comparing: 152bfe3...2c3e4a7

Critical size changes

Includes critical production bundles, as well as any change greater than 2%:

Name	+/-	Base	Current	+/- gzip	Base gzip	Current gzip
oss-stable/react-dom/cjs/react-dom.production.js	=	6.68 kB	6.68 kB	=	1.83 kB	1.83 kB
oss-stable/react-dom/cjs/react-dom-client.production.js	=	514.52 kB	514.55 kB	=	91.76 kB	91.76 kB
oss-experimental/react-dom/cjs/react-dom.production.js	=	6.69 kB	6.69 kB	=	1.83 kB	1.83 kB
oss-experimental/react-dom/cjs/react-dom-client.production.js	=	557.55 kB	557.58 kB	=	99.01 kB	99.01 kB
facebook-www/ReactDOM-prod.classic.js	=	596.50 kB	596.54 kB	=	104.89 kB	104.88 kB
facebook-www/ReactDOM-prod.modern.js	=	586.92 kB	586.95 kB	=	103.35 kB	103.35 kB

Significant size changes

Includes any change greater than 0.2%:

(No significant changes)

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