Use CondSend / CondSync

[DougAnderson444]

bs/crates/content-addressable/src/block.rs

Line 6 in fa0cfc8

pub trait Block<'a, K>: Send + Sync {

You may want to make these conditional, so that the Send bound is not present for wasm targets.

This may be important when block are stored in browser storage or other non-native interface

See this example:
https://github.com/eigerco/blockstore/blob/main/src/cond_send.rs

[dhuseby]

I like this. I'll set up a PR ASAP.