=== modified file 'common.zsh'
--- common.zsh	2017-11-30 21:32:35 +0000
+++ common.zsh	2017-11-30 21:07:53 +0000
@@ -95,8 +95,7 @@
 
 exit-if-unchanged() {
 	[[ -f $FILE ]] || return
-	print-meta > $FILE.new
-	if cmp >&2 $FILE.new $FILE; then
+	if print-meta | cmp >&2 - $FILE; then
 		cp $FILE $OUT
 		exit 0
 	else