token balance checkpointing extension

[z0r0z]

Solmate should support a minimalist, compound-style module for voting that checkpoints balances over time. I imagine we can make this extensible with both ERC20 and ERC721 tokens. Supporting delegation feels a bit opinionated and might be its own separate module. To better support cross-chain composability and upcoming merge (with fixed block times), unix timestamps should be used rather than block numbers. This may nudge OZ to follow as well.

[jaglinux]

block.timestamp is provided by the miner , right ? subjected to miner manipulation.

[z0r0z]

sure @jaglinux But I would argue this remote risk is outweighed by the benefits. In any case, a solmate-style pattern for checkpointing balances seems useful.