Python SDK upsert confusion regarding string vs json

According to this doc:

http://pythonhosted.org/couchbase/api/couchbase.html#single-key-data-methods

the value must be either a bytes or str object encodable as UTF-8.

So based on that, I tried:

doc = bucket.upsert("mydoc2", '

')

however when I tried to later fetch that doc, it was not recognized as JSON

OTOH, if I passed it a dictionary:

doc = bucket.upsert("mydoc3", json.loads('

'))

then it worked, and the doc was recognized as JSON

Also, I was surprised to find zero examples of storing JSON.. i