release notes

NixOS · Jan 16, 2023 · a90ddaf · a90ddaf
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 * The `repeat` and `enforce-determinism` options have been removed
   since they had been broken under many circumstances for a long time.
+
+* A new function `builtins.readFileType` is available. It is similar to
+  `builtins.readDir` but acts on a single file or directory.
+
+* The `builtins.readDir` function has been optimized when encountering unknown
+  file types from POSIX's `readdir`. In such cases the type of each file is/was
+  discovered by making multiple syscalls. This change makes these operations
+  lazy such that these lookups will only be performed if the attribute is used.
+  This optimization effects a minority of filesystems and operating systems.