code: @SuppressWarnings("unchecked")
    protected boolean removeMapping(Object o) {
      freePendingTables();
  
      if (!(o instanceof Entry<?, ?>)) {
        return false;
      }
  
      Entry<K, V> e = (Entry<K, V>) o;
  
      Object key = e.getKey();
      int hash = key.hashCode();
  
      hashtable.position(indexFor(spread(hash)));
  
      for (int i = 0; i < reprobeLimit(); i++) {
        if (!hashtable.hasRemaining()) {
          hashtable.rewind();
        }
  
        IntBuffer entry = (IntBuffer) hashtable.slice().limit(ENTRY_SIZE);
  
        if (isTerminating(entry)) {
          return false;
        } else if (isPresent(entry) && keyEquals(key, hash, readLong(entry, ENCODING), entry.get(KEY_HASHCODE))
            && storageEngine.equalsValue(e.getValue(), readLong(entry, ENCODING))) {
          storageEngine.freeMapping(readLong(entry, ENCODING), entry.get(KEY_HASHCODE), true);
  
          entry.put(STATUS, STATUS_REMOVED);
          slotRemoved(entry);
          shrink();
          return true;
        } else {
          hashtable.position(hashtable.position() + ENTRY_SIZE);
        }
      }
  
      return false;
    }
docs: /*
  remove used by EntrySet