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var getKeys = require('./_object-keys');
var toIObject = require('./_to-iobject');
module.exports = function (object, el) {
var O = toIObject(object);
var keys = getKeys(O);
var length = keys.length;
var index = 0;
var key;
while (length > index) if (O[key = keys[index++]] === el) return key;
};
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