The scope of "Range foreach" depends on the number of invocation arguments

Hello Again

Why is the callers scope not visible in the execution scope of the Range foreach message, when the Range foreach message is invoked with only a single argument - the message tree. When foreach is invoked with the two arguments - value and message tree - then the callers scope is visible as expected.

Example:
replicate := method(
        string, numberOfTimes,
        res := ""
        Range 1 to(numberOfTimes) foreach(v, res = res .. string)
)

replicate_throws_exception := method(
        string, numberOfTimes,
        res := ""
        Range 1 to(numberOfTimes) foreach(res = res .. string)
)

replicate("a", 10) println
replicate_throws_exception("a", 10) println

The output is the following:
$ io foreach_strange_behavior.io
aaaaaaaaaa

  Exception: Slot res not found. Must define slot using := operator before updating.
  ---------
  updateSlot                          foreach_strange_behavior.io 10
  Object replicate_throws_exception    foreach_strange_behavior.io 14
  CLI doFile                           Z_CLI.io 140
  CLI run                              IoState_runCLI() 1

Best regards, Eebel.