The utility of ToDelimitedString overloads accepting zero arguments and using the list separator from the current culture is of very marginal utility and should be considered as a strong candidate for removal in the next major version/release as a breaking change. If so, then the next release should mark those methods as being obsolete.

Should null then be allowed as a delimiter to keep consistency with String.Join that does, and treats null effectively as an empty string?

This issue has been forked from #116.