"effect/HashMap#countBy":
  replacement: "HashMap.reduce"
  note: "Count matches with HashMap.reduce(self, 0, (count, value, key) => count + (predicate(value, key) ? 1 : 0))."
"effect/HashMap#HashMap":
  replacement: "HashMap.HashMap"
  note: "The immutable two-parameter model remains; use public operations rather than depending on its representation."
"effect/HashMap#keySet":
  replacement: "HashSet.fromIterable + HashMap.keys"
  note: "Construct the set with HashSet.fromIterable(HashMap.keys(self)); no direct keySet helper remains."
"effect/HashMap#TypeId":
  replacement: "HashMap.isHashMap"
  note: "The brand is private; use HashMap.isHashMap for runtime refinement and HashMap.HashMap<K, V> in type positions."
"effect/HashMap#unsafeGet":
  replacement: "HashMap.getUnsafe"
  note: "Direct word-order rename; it still throws for a missing key."