/**
     * The optional interpolation source used for interpolation.
     *
     * @return the interpolation source for interpolation
     */
    @Nonnull
    Optional<UnaryOperator<String>> getInterpolationSource();

    @Nonnull
    static SettingsBuilderRequest build(
            @Nonnull ProtoSession session,
            @Nonnull Source installationSettingsSource,
            @Nonnull Source userSettingsSource) {