nickamorim

Empty String Stored when `cache_nils: false` and `raw: true`

3

## Description When storing a `nil` value with the `raw: true` request option, Dalli stores an empty string even though `cache_nils` is false [[ref](https://github.com/petergoldstein/dalli/blob/main/lib/dalli/protocol/value_serializer.rb#L31)]. This especially doesn't play nice with...