Type-safe BuilderIndex #8676
Description
Description
The BuilderIndex in the spec is just a u64, but the max value (u64::MAX) is used to encode self-building.
If self-building sticks around, it might be nice to use the type system to keep track of "raw" builder indices (which may be u64::MAX), vs sanitised ones. There could be a method on raw builder index to convert to a clean one.
impl RawBuilderIndex {
fn builder_index(self, proposer_index: u64) -> u64 {
if self == u64::MAX { proposer_index } else { self }
}
}