memory management barfs 5.005_56+

tvgen.pl
  copy tvcommon.[ch] only if newer

avoid installing .so stuff?


*** SCALING UP

allow treefill/depth updates to be switched off temporarily?
  reduce the need for write locks == parallel insert mode...?

optimized arrays ops: tc_splice(...) !!

perl interface -> separate extension
  REFCNT!
  push/unshift & pop/shift flags
  transient hash-ref indices?
  tied array API & glue
  array: mapkeys / mapvalues?

OPTIMIZE!

tc_delete
  try 2-level rotations?
  try to coalesce nodes before they are completely empty