put back fct signature with string

3 jobs for lh-remove-duplicate in 8 minutes and 49 seconds (queued for 4 seconds)
Status Name Job ID Coverage
  Test
passed docker:julia1.7 #319850

00:07:39

passed format #319851
privileged

00:01:42

 
  Documentation
passed doc-tests-pr:julia1.7 #319852

00:01:10