Assigning String Values to Key Ids

[TutubanaS]

Hi,
First, I can't tell you how thankful I am; I love Faiss, and it probably kicked off my ML career. What I realized is working with integer IDs requires a mapping to your elements if they have unique keys as strings. To give an example, my embeddings and data are stored in Firebase where each embedding is assigned with a unique key ID and when I execute a faiss search, I have to go through a mapping which adds a single level of complexity. Do you guys have any plans to implement adding string values as keys? I would love to contribute if possible.