Question about the amplify library

[cymqqqq]

Hi there, I found a lot of amplify related functions used in rgb lib source code, so I want to ask why is amplify chosen here, any advantages or disadvantages? Can we just use hashmap or hashset instead of tinyordmap and so on?

[dr-orlovsky]

Rationale:

1, I am the author and maintainer of amplify crates. I wrote them specifically to avoid external dependencies for the consensus-critical code as much as possible.
2. TinyOrdMap you are mentioning is an example of so-called confined collections from by the amplify crate. Their purpose is to provide compile-time guarantees on the collection size (upper and lower bounds).
3. thus no, we can't "just use" hashmap or hashset since we will lose these guarantees.