test_windows_float64array_tco_gc.cjs
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test_windows_float64array_tco_gc.cjs
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	function normalize(pair) {
	if (pair[0] === 0) {
	pair[1] = 0;
	return pair;
	}

	while (pair[0] >= 10) {
	pair[0] /= 10;
	pair[1]++;
	}

	while (pair[0] < 1) {
	pair[0] *= 10;
	pair[1]--;
	}

	return pair;
	}

	function fib(n, a = new Float64Array([0, 0]), b = new Float64Array([1, 0])) {
	if (n === 0) return `${a[0].toPrecision(17)}e+${a[1]}`;

	const next = new Float64Array(2);

	if (a[1] > b[1]) {
	next[0] = a[0] + b[0] / 10 ** (a[1] - b[1]);
	next[1] = a[1];
	} else {
	next[0] = b[0] + a[0] / 10 ** (b[1] - a[1]);
	next[1] = b[1];
	}

	return fib(n - 1, b, normalize(next));
	}

	const result = fib(5000);
	if (typeof result !== 'string' \|\| !result.includes('e+')) {
	throw new Error('unexpected fibonacci result: ' + result);
	}

	console.log('Float64Array TCO GC regression ok');

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