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Hey I'm new to Rust and I have this code which is attempting to Deserialize an object coming from a window function in the browser in a leptos front end rust project:

#[derive(Deserialize, Debug)]
pub struct PublicKey {
  pub _bn: BN
}

but I get:

error[E0277]: the trait bound `BN: provider::_::_serde::Deserialize<'_>` is not satisfied
    --> src/pages/provider.rs:329:12
     |
329  |   pub _bn: BN
     |            ^^ the trait `provider::_::_serde::Deserialize<'_>` is not implemented for `BN`

The library that injects into the window uses bn.js here: https://github.com/solana-labs/solana-web3.js/blob/c250eb4/packages/library-legacy/src/publickey.ts#L35

any idea how to handle this?