Remove cell

[Alligator]

semantic changes this makes:

$ in ENDFILE is set to whatever it was at the end of BEGINFILE.

arrays are now always copied by reference in function calls. that wasn't intentional, previously Value stored arrays as []*Cell. mutating items in the array would work:

BEGIN {
  function x(arr) { arr[0] = 4 }
  a = [1]
  x(a)
  print a
}

prints [4]

But growing the array would not:

BEGIN {
  function x(arr) { arr[0] = 4 }
  a = []
  x(a)
  print a
}

prints []

trying to read $ in BEGIN or END is now a runtime error (unknown variable $).