message: Expose 3 SmallMap iterators
  Summary: These three have IntoIterator methods, so are visible externally. They should have always been exposed from the crate.
diff: pub use crate::collections::{
  hash::{BorrowHashed, Hashed, SmallHashResult},
  - small_map::SmallMap,
  + small_map::{MHIntoIter, MHIter, MHIterMut, SmallMap},
  small_set::SmallSet,
  };
  