in hpack/src/main/java/com/twitter/hpack/Encoder.java [441:447]
private void remove() {
before.after = after;
after.before = before;
before = null; // null reference to prevent nepotism with generational GC.
after = null; // null reference to prevent nepotism with generational GC.
next = null; // null reference to prevent nepotism with generational GC.
}