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// Create default NumberFormat.
var nf = new Intl.NumberFormat();

var beforeCount = Object.getOwnPropertyNames(nf).length;

// Array we want to iterate, actual numbers are not important.
var numberArray = [1, 2, 3];

// It shouldn't throw.
// The format() method should be properly bound to the nf object.
numberArray.forEach(nf.format);

// Formatting a number should work in a direct call.
nf.format(12345);

// Reading the format doesn't add any additional property keys
assertEquals(beforeCount, Object.getOwnPropertyNames(nf).length);