Github user nsuke commented on the issue:
https://github.com/apache/thrift/pull/1289
Basically yes with some note.
It's typically not a UTF-8 encoded binary. To write utf8 strings we can use
`writeString`. The point is that `writeBinary` is for writing binaries.
The real problem here is that py2 `str` *is* `byte` but py3 `str` is not.
This forces many python users to put this kind of conversions everywhere when
migration from 2 to 3. Putting this in Apache Thrift will save their time,
while introducing potential surprises to another set of users.
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