Update src/libflake/lockfile.cc

Co-authored-by: Sergei Zimmerman <sergei@zimmerman.foo>

Author: fzakaria

src/libflake/lockfile.cc

@@ -189,9 +189,7 @@ std::pair<nlohmann::json, LockFile::KeyMap> LockFile::toJSON() const
     boost::unordered_flat_set<std::string> keys;
 
     /* The highest numeric suffix already handed out for a given base key.
-       Restarting the search at 2 for every collision is quadratic when many
-       nodes share a base name, which is exactly what happens in a flake with
-       hundreds of inputs that each pull in their own "systems" or "nixpkgs". */
+       Used to amortise name deduplication by memoising the lower bound of suffixes that definitely cannot be used. */
     boost::unordered_flat_map<std::string, int> keySuffixes;
 
     auto dumpNode = [&](this auto & dumpNode, std::string key, ref<const Node> node) -> std::string {