Fix some property enforcements.
Merge pull request #2479 from denis-sh/fix-some-property-enforcements

Fix some property enforcements.
Change unittest from writing output to concatening to an array and checking the content
Merge pull request #2480 from MetaLang/tee-unittest-fix

Change unittest from writing output to concatening to an array and checking content
Add empty check for haystack range r in skipOver()

Remove space
Merge pull request #2481 from nordlow/empty-skipOver

Add empty check for haystack range r in skipOver()
Merge remote-tracking branch 'upstream/master'