Unicode errors when casting tower_send data to_json for tower_receive (nested values)

[tgates81]

Due to the nested values tower_receive often produces (like a list of dictionaries) I've found it necessary to cast the register output to_json before sending to tower_send. This seems to work well except when it comes across special character encodings like a letter with an accent, to_json just chokes:

`

UnicodeEncodeError: 'ascii' codec can't encode character u'\xe1' in position 4: ordinal not in range(128)

`

I can't figure out a way around this despite using b64de(encode) filters. Am I incorrect in casting the output from tower_receive to_json or is this is a separate issue? Either way documentation should reflect what to do.