+ # Values from Robot can introduce type unicode,
+ # we need to encode them, so that repr() does not lead with 'u'.
+ if isinstance(rate, unicode):
+ rate = rate.encode("utf-8")
+ if isinstance(duration, unicode):
+ duration = duration.encode("utf-8")
+ if isinstance(warmup_time, unicode):
+ warmup_time = warmup_time.encode("utf-8")