Storing nulls?

[polytypic]

It seems that the current interface doesn't support storing nulls, because get returns null in case a value is not found or is expired and there is no separate function to query whether a value exists with a given key.

My use case would be to store properties with default values. So, if there is a property whose default value is not null, but whose value can be null, then lscache cannot be used to consistently store such a property.

Edit: Of course, one could wrap (nullable) values inside a container object, but that is a bad, because it increases the amount of storage space needed.