private void addObjectAndNotify(IN_NAME name, Iterable<?> values, boolean notifyChange) {
        final NAME normalizedName = normalizeName(name);
        requireNonNull(values, "values");
        for (Object v : values) {
            requireNonNullElement(values, v);
            addObjectAndNotify(normalizedName, v, false);
        }
        if (notifyChange) {
            onChange(normalizedName);
        }
    }
Only adds the specified {@code name} and {@code values}, and do not notify the changes via
{@link #onChange(CharSequence)}.
core/src/main/java/com/linecorp/armeria/common/StringMultimap.java