Decided to export the Transformer after all.

censor.go

@@ -227,14 +227,16 @@ func (*tf) Reset() {
 }
 
 // Transformer implements [transform.Transformer], censoring any likely keys it encounters.
-// Not exporting at this time, as it's bugged and a correct version might require maintaining state.
-// var Transformer transform.Transformer = (*tf)(nil)
+//
+// WARNING: The current implementation doesn't match the output of [CensorLikelyKeys], so I definitely
+// have a bug somewhere.
+var Transformer transform.Transformer = (*tf)(nil)
 
 // Copy copies r to w, censoring any likely keys it encounters.
 //
 // WARNING: The current implementation doesn't match the output of [CensorLikelyKeys], so I definitely
 // have a bug somewhere.
 func Copy(w io.Writer, r io.Reader) error {
-	_, err := io.Copy(w, transform.NewReader(r, (*tf)(nil)))
+	_, err := io.Copy(w, transform.NewReader(r, Transformer))
 	return err
 }