We've modified our NUnitLite to special-case the native types, so that they
can easily be compared with the standard types, but that doesn't work anymore
when switching to the official NUnit[Lite], so change all asserts to
explicitly convert whenever needed.
* Fix many version checks to be based on Xcode version instead of iOS version.
* Added/fixed a few expected values according to platform version to match behavior in older macOS versions.
Rolf Bjarne Kvinge
Timothy Risi