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Create a resource between 0 and N times terraform

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The common way this seems to get done, is via something like count = "${length(split(",", var.private_subnets))}" However, this results in either needing trailing commas, or being unable to handle the 0 case:
Eg:
  • ${length(split(",", ""))} is 1
  • ${length(split(",", "foo"))} is 1
  • ${length(split(",", "foo,bar"))} is 2
  • ${length(split(",", "")) -1 } is 0
  • ${length(split(",", "foo")) - 1} is 0
  • ${length(split(",", "foo,")) - 1} is 1
  • ${length(split(",", "foo,bar")) - 1} is 1
neither of those is very satisfying
the compact function was somewhat recently added to deal with empty strings when splitting so, for example:
  • ${length(compact(split(",", "")))} should be 0
  • ${length(compact(split(",", "foo")))} should be 1
  • ${length(compact(split(",", "foo,bar")))} should be 2
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