diff --git a/flake.nix b/flake.nix
index 4e51d15..34d58c0 100644
--- a/flake.nix
+++ b/flake.nix
@@ -16,5 +16,6 @@
     unique = import ./src/unique.nix lib;
     overrideExisting = import ./src/overrideExisting.nix lib;
     findFirstIndex = import ./src/findFirstIndex.nix lib;
+    filterAttrs = import ./src/filterAttrs.nix lib;
   };
 }
diff --git a/src/filterAttrs.nix b/src/filterAttrs.nix
new file mode 100644
index 0000000..14a2b11
--- /dev/null
+++ b/src/filterAttrs.nix
@@ -0,0 +1,11 @@
+lib:
+let
+  filterAttrsOld = pred: set: builtins.removeAttrs set (builtins.filter (name: !pred name set.${name}) (builtins.attrNames set));
+
+  filterAttrsNew = pred: set: builtins.removeAttrs set (builtins.partition (name: pred name set.${name}) (builtins.attrNames set)).wrong;
+
+  bigdata = lib.genAttrs (lib.imap0 (i: _: toString i) (lib.replicate 999999 null)) (_: null);
+in {
+  old = filterAttrsOld (name: value: name == "345" || name == "927") bigdata;
+  new = filterAttrsNew (name: value: name == "345" || name == "927") bigdata;
+}