node_modules/rambda/src/_internals/isInteger.js - devtools/devtools-frontend.git - Git at Google

 function _isInteger(n){
   return n << 0 === n
 }

 export const isInteger = Number.isInteger || _isInteger
	function _isInteger(n){
	return n << 0 === n
	}

	export const isInteger = Number.isInteger \|\| _isInteger