I’m often unsure if write some functions at top-level or in a singleton object.  As example, I’ve noted the function generateSequence in stdlib is at top-level, but probably it could be declared as Sequence.generate. So why have you preferred this?  Essentially they are equivalent, but there are some differences:   top-level declarations are directly available from the code completion list, so they should be easier to find top-level names can clash easily with other declarations declarations at ...