src/async/fiberManager.js
function adjustFiberCount(delta) {
    activeFiberCount += delta;
    if (activeFiberCount >= fiberPoolSize) {
        fiberPoolSize += 100;
        Fiber.poolSize = fiberPoolSize;
    }
}
function adjustFiberCount(delta) {
    activeFiberCount += delta;
    if (activeFiberCount >= fiberPoolSize) {
        fiberPoolSize += 100;
        Fiber.poolSize = fiberPoolSize;
    }
}
The following functionality prevents memory leaks in node-fibers by actively managing Fiber.poolSize.
For more information, see https://github.com/laverdet/node-fibers/issues/169.