@API(status = API.Status.STABLE)
    public @NonNull Collection<@NonNull String> aliases() {
        return Collections.unmodifiableCollection(this.allAcceptedAliases);
    }
Returns the aliases, if relevant.
<p>
Only literal components may have aliases. If this is a non-literal
component then an empty collection is returned.

@return unmodifiable view of the aliases
cloud-core/src/main/java/org/incendo/cloud/parser/standard/LiteralParser.java