guava/src/com/google/common/collect/MapMakerInternalMap.java
E getEntry(@Nullable Object key) {
    if (key == null) {
      return null;
    }
    int hash = hash(key);
    return segmentFor(hash).getEntry(key, hash);
  }
E getEntry(@Nullable Object key) {
    if (key == null) {
      return null;
    }
    int hash = hash(key);
    return segmentFor(hash).getEntry(key, hash);
  }
Returns the internal entry for the specified key. The entry may be computing or partially
collected. Does not impact recency ordering.