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function f(ta, i) {
var x = i + 0.2;
return ta[i] + ta[i | 0] + ta[x - 0.2];
}
var ta = new Int32Array(10);
var xs = [0, 1, 2, -1];
for (var i = 0; i < 100_000; ++i) {
assertEq(f(ta, xs[i & 3]), (i & 3) == 3 ? NaN : 0);
}