Simple code that breaks without trampoline

needsTrampoline.js

if (!require('streamline/module')(module)) return;

function fibo(_, n) {
	return n > 1 ? fibo(_, n - 1) + fibo(_, n - 2) : 1;
}

function fibo2(_, n) {
	return n > 1 ? trampo(this, 0, fibo2, _, n - 1) + trampo(this, 0, fibo2, _, n - 2) : 1;
}

function trampo(thisObj, index, fn) {
	var state = 0,
		err, result, args = Array.prototype.slice.call(arguments, 3), cb = args[index];

	args[index] = function(e, r) {
		if (state === 1) { // async
			cb(e, r);
		} else { // sync
			state = 1;
			err = e;
			result = r;
		}
	};
	fn.apply(thisObj, args);
	if (state === 0) {
		state = 1;
	} else {
		cb(err, result);
	}
}

function fibo3(_, n) {
	process.nextTick(_);
	return n > 1 ? fibo3(_, n - 1) + fibo3(_, n - 2) : 1;
}


// console.log(fibo(_, 15)); // causes stack overflow
console.log(fibo2(_, 25)); // works!
console.log(fibo3(_, 25)); // works too!