default Map<String, Property<?>> getPersistentProperties() {
		return getProperties().entrySet().stream()
				.filter((e) -> e.getValue().persistent())
				.collect(Collectors.toMap(Map.Entry::getKey, Map.Entry::getValue));
	}
@return Properties, but only those that are {@link Property#persistent()}.
recaf-core/src/main/java/software/coley/recaf/info/properties/PropertyContainer.java