ONE: expecting global undolevels: 5, local undolevels: -123456 (default)
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  undolevels=5 global
  undolevels=-123456 local
TWO: expecting global undolevels: 5, local undolevels: 2 (first) then 10 (afterwards)
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  undolevels=5 global
  undolevels=2 local

  undolevels=5 global
  undolevels=10 local

global value shouldn't be changed and still be 5!
ONE: expecting global undolevels: 5, local undolevels: -123456 (default)
  undolevels=5 global
  undolevels=-123456 local

global value should be changed to 50
THREE: expecting global undolevels: 50, local undolevels: -123456 (default)

  undolevels=50 global
  undolevels=-123456 local