The signature of actor.call is unclear of what magic number to put as the second argument.

pub fn call(
  subject: process.Subject,
  waiting timeout: Int,
  sending make_message: fn(process.Subject(reply)) -> message,
) -> reply

If a reply is not received within the given timeout then the sender process crashes rather than leaving the processes in an invalid state.

As Gleam is a typed language, I would expect a Duration for this kind of value, instead of a undocumented Int that must be in milliseconds.

Alternatives:

• rename the parameter as timeout_ms
• make it clear in the documentation that it expects milliseconds

What do you think?