@API(status = API.Status.STABLE)
    public void captionFormatter(final @NonNull CaptionFormatter<C, String> captionFormatter) {
        this.captionVariableReplacementHandler = captionFormatter;
    }
Sets the string-producing caption formatter.

@param captionFormatter the new formatter
@see #captionFormatter()
cloud-core/src/main/java/org/incendo/cloud/CommandManager.java