final void addObject(IN_NAME name, Object value) {
        final NAME normalizedName = normalizeName(name);
        requireNonNull(value, "value");
        addObjectAndNotify(normalizedName, value, true);
    }
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