If the file offered by the remote already exists, reject if it's the same

size and date.

Previously, it would always skip which could result in the uplink holding
the files indefiniately.

exec/binkit.js

@@ -406,9 +406,14 @@ function callout_want_callback(fobj, fsize, fdate, offset, bp)
 	// Or process the old ones first.
 	if (this.received_files.indexOf(fobj.name) != -1)
 		return this.file.REJECT;
-	// Skip existing files.
-	if (file_exists(fobj.name))
+	// Reject or skip existing files.
+	if (file_exists(fobj.name)) {
+		// If the size and date are the same, reject it.
+		if (fsize == file_size(fobj.name) && fdate == file_date(fobj.name))
+			return this.file.REJECT;
+		// Otherwise, skip it.
 		return this.file.SKIP;
+	}
 	// Accept everything else
 	return this.file.ACCEPT;
 }