public static <K extends Comparable<K>, V> MultiMapBuilder<K, V, Collection<V>> treeKeys() {
		return new MultiMapBuilder<>(TreeMap::new);
	}
Creates new multi-map builder with tree keys.

@param <K>
		Key type.
@param <V>
		Value type.

@return New builder.
recaf-core/src/main/java/software/coley/recaf/util/MultiMapBuilder.java