4 lines
		
	
	
		
			73 B
		
	
	
	
		
			JavaScript
		
	
	
	
	
	
			
		
		
	
	
			4 lines
		
	
	
		
			73 B
		
	
	
	
		
			JavaScript
		
	
	
	
	
	
| module.exports = Number.isNaN || function isNaN(a) {
 | |
| 	return a !== a;
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| };
 |