Merge branch 'add-optimized-functions' into 'master'

Add optimized functions (strict folds on Map; concat for 3-5 strings)

See merge request !363
2 jobs for master in 2 minutes and 54 seconds (queued for 1 second)
Status Job ID Name Coverage
  Test
passed #108540
linux-x64

00:02:33

passed #108541
linux-x86

00:02:54