@Nonnull
	public static Collection<String> get(@Nonnull ClassInfo info) {
		Property<?> property = info.getProperties().get(KEY);
		if (property instanceof UnknownAttributesProperty unknown)
			return Objects.requireNonNullElse(unknown.value(), Collections.emptyList());
		return Collections.emptyList();
	}
@param info
		Class to check for this marker on.

@return Collection of unknown attributes on the class.
recaf-core/src/main/java/software/coley/recaf/info/properties/builtin/UnknownAttributesProperty.java