if {![info exists loginCookie]} then {
      return false
    }

    if {[isEagle] || \
        ([info exists tcl_version] && $tcl_version >= 8.5)} then {
      if {![string is list -strict $loginCookie]} then {
        return false
      }
    }

    if {[llength $loginCookie] != 2} then {
      return false
    }