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var str = "abcdef";

// Get a prefix of the string into the one-char string cache.
assertEquals("a", str[0]);
assertEquals("b", str[1]);
assertEquals("c", str[2]);

// Splitting by "" calls runtime StringToArray function that uses the
// cache. So this test hits a case where only a prefix is cached.
var array = str.split("");
var expected = ["a", "b", "c", "d", "e", "f"];
assertArrayEquals(expected, array);