[Proposal] 64-bit arithmetic in Script

In the email, the sender discusses a proposal made by someone named Chris, expressing interest but also suggesting a potential alternative. The sender references Rusty's GSR, which includes arbitrary-sized integers and their associated operations. This system is praised for its fine-grained accounting of operations based on operand size, ensuring scripts remain performant and manageable. It's noted that Rusty's proposal is more advanced in terms of design and analysis. The sender suggests that Chris might consider joining efforts with Rusty's project to better address his use-cases. This exchange occurred within the context of the Bitcoin Development Mailing List, indicating a focus on cryptocurrency technology development.