New issue 3013: os.rename crashes rpython when you pass in a byte string
filename
https://bitbucket.org/pypy/pypy/issues/3013/osrename-crashes-rpython-when-you-pass-in
Milton Thomas:
To reproduce:
```
import os
os.rename( bytes("a", "utf8"), bytes("b", "utf8"))
```
result:
```
RPython traceback:
File "implement_8.c", line 402, in
BuiltinActivation_UwS_ObjSpace_W_Root_W_Root_kwo_3
File "pypy_module_posix.c", line 18574, in dispatch__star_0_2
Fatal RPython error: AssertionError
```
Discovered this because a library in the wild opened a file in read-binary mode
and pulled the file path out as bytes.
Works in CPython 3.7.3.
OS is Windows 10, PyPy version is PyPy3.6 7.1.1.
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