message: Don't slow down with fewer than 50% failed rounds.
  Since this is hard-coded and it's reasonable to set any fault tolerance
  threshold up to 50%, let's make sure that fewer than 50% of the
  validators cannot force the others to increase their round length.
diff: @@ -15,7 +15,7 @@ use crate::{
  const NUM_ROUNDS_TO_CONSIDER: usize = 40;
  // The maximum number of failures allowed among NUM_ROUNDS_TO_CONSIDER latest rounds, with which we
  // won't increase our round length. Exceeding this threshold will mean that we should slow down.
  -const MAX_FAILED_ROUNDS: usize = 10;
  +const MAX_FAILED_ROUNDS: usize = 20;
  // We will try to accelerate (decrease our round exponent) every `ACCELERATION_PARAMETER` rounds if
  // we have few enough failures.
  const ACCELERATION_PARAMETER: u64 = 40;
  