• breaking change:
  
  • the behaviour of UNIVERSAL methods like $native->can and
    $native->isa is now defined as being the same as when autobox
    is not enabled rather than "undefined". (technically, this
    still falls under the rubric of "undefined", but the switch
    from "don't know" to "don't" could break buggy code, so bump
    for safety)
    
  • add DOES to the list of non-autoboxed methods
    
• switch to SemVer i.e. 2.86 (v2.860.0) -> 3.0.0 (v3.0.0)
  
• upgrade ppport.h from 3.35 -> 3.42