• Remove '-I/--isolate' which has never worked correctly
• Fix compiling when NO_HARDLINKS and NO_SYMLINKS are both defined
• Increased stack size limits to enable deeper recursion without crashing
• Fixes to make compilation under Cygwin (instead of MSYS2 MinGW) work
• Remove the temporary '-X help' warning about changes in functionality
• Some minor under-the-hood changes for future enhancements