This is under beta 5 (win95), but another user has reported that it also
generates an error under beta 6.

Isn't int allowed in iso-functions or is this a bug?

#include "functions.inc"
#declare fn_X = function(x,y,z) {int(x) }
isosurface {
  function { fn_X(x, y, z) }
  contained_by { box { -1, 1 } }
  accuracy 0.001
  max_gradient 4
  pigment{Yellow}
}

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