cloneWithAllocator

pub fn cloneWithAllocator(
    self: *const BufSet,
    new_allocator: Allocator,
) Allocator.Error!BufSet {
    const cloned_hashmap = try self.hash_map.cloneWithAllocator(new_allocator);
    const cloned = BufSet{ .hash_map = cloned_hashmap };
    var it = cloned.hash_map.keyIterator();
    while (it.next()) |key_ptr| {
        key_ptr.* = try cloned.copy(key_ptr.*);
    }

    return cloned;
}