Package check result: NOTE

Check: compiled code, Result: NOTE
  File ‘RNiftyReg/libs/RNiftyReg.so’:
    Found non-API call to R: ‘SET_TYPEOF’
  
  Compiled code should not call non-API entry points in R.
  
  See ‘Writing portable packages’ in the ‘Writing R Extensions’ manual,
  and section ‘Moving into C API compliance’ for issues with the use of
  non-API entry points.

No changes to worse in reverse depends.