@Nullable
    @Override
    public String getLast(IN_NAME name) {
        requireNonNull(name, "name");
        final int h = hashName(name);
        final int i = index(h);
        Entry e = entries[i];
        while (e != null) {
            if (e.hash == h) {
                final NAME currentName = e.key;
                if (currentName != null && nameEquals(currentName, name)) {
                    return e.value;
                }
            }
            e = e.next;
        }
        return null;
    }
Validates the given user-specified {@code value}.
core/src/main/java/com/linecorp/armeria/common/StringMultimap.java