Kakscript: boolean / string / error equality testing

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A quick note: I think this mostly supersedes @andreyorst 's if-then-else technique, because

def some-function-using-if_then_else -params 3 %{
try %{
  "mypkg-str-literal-true-%arg{1}"
  # IF PART
  echo -debug %arg{2}
} catch %{
  # ELSE PART
  echo -debug %arg{3}
}
}

can evaluate its arguments. If- and else- strings, OTOH, if passed to an if function, would be evaluated in that function’s context, so %arg's would be nonsense — and access to the original args would need to be arranged via saving them in an option.