Release 2.16 (2023-05-31)

• Speed-up of downloads from binary caches. The number of parallel downloads (also known as substitutions) has been separated from the --max-jobs setting. The new setting is called max-substitution-jobs. The number of parallel downloads is now set to 16 by default (previously, the default was 1 due to the coupling to build jobs).

• The function builtins.replaceStrings is now lazy in the value of its second argument to. That is, to is only evaluated when its corresponding pattern in from is matched in the string s.