• fix: clone deep hash and mixed array/hash structures past MAX_DEPTH
  without C stack growth (GH #121, GH #146)
  
• fix: support cloning Perl 5.38+ class instances (SVt_PVOBJ)
  
• fix: count nesting depth, not call count, in rdepth
  
• fix: honour depth==0 when rdepth exceeds MAX_DEPTH on wide structures
  
• fix: preserve shared RV identity in rv_clone_iterative
  
• fix: guard rv_clone_iterative against scalar-ref cycles past MAX_DEPTH
  
• fix: share non-cloneable leaves in rv_clone_iterative
  
• fix: preserve blessings in iterative array chain walking (GH #121)
  
• fix: deep-copy leaf scalars past MAX_DEPTH instead of aliasing
  
• fix: release cloned mg_obj refcount after sv_magic (memory leak)
  
• fix: remove leaked Newxz buffer in magic mg_ptr cloning
  
• fix: use SAVEFREESV for exception-safe hseen/weakrefs cleanup
  
• fix: avoid shell in ps invocation for MacPorts / sandboxed macOS (GH #122)
  
• refactor: extract magic cloning to clone_magic() helper
  
• refactor: fix TRACEME debug infrastructure for 64-bit and MSVC
  
• chore: update ppport.h from 3.68 to 3.73
  
• test: add coverage for clone($ref, $depth), edge cases, class objects
  
• docs: fix duplicate Synopsis header and update LIMITATIONS section
  
• ci: add macOS, refresh Linux distro matrix, fix Windows build step