previously (only on Python 2), the following line was silently coercing to Unicode using default 'ascii' encoding, whenever the input string was a `bytes` string (same as `str` in PY2):
namerecord.string = string.encode(namerecord.getEncoding())
On Python 3, the line above would crash, since bytes objects don't have an `encode` method (and rightly so).
`setName` should now accept both Unicode or bytes, but will issue a warning if the latter are used.
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