Features from optional dependencies

governor implicit feature

Enables governor ^0.6

governor:

A rate-limiting implementation in Rust

Affects stream-ext::LimiterExt.governor_limiter

leaky-bucket implicit feature

Enables leaky-bucket

leaky-bucket:

A token-based rate limiter based on the leaky bucket algorithm

Affects stream-ext::LimiterExt.leaky_bucket_limiter