//! Public fairness policies for pooled client handles.
/// Fairness policy used when many `PoolHandle`s contend for pooled leases.
///
/// `RoundRobin` is the default because it gives stable logical sessions turns
/// in rotation. `Fifo` preserves the exact order in which blocked acquisitions
/// arrived.
///
/// # Examples
///
/// ```
/// use wireframe::client::{ClientPoolConfig, PoolFairnessPolicy};
///
/// let config = ClientPoolConfig::default()
/// .pool_size(2)
/// .fairness_policy(PoolFairnessPolicy::RoundRobin);
///
/// assert_eq!(
/// config.fairness_policy_value(),
/// PoolFairnessPolicy::RoundRobin
/// );
/// ```