New issue 1902: PyPy3: "IOError: [Errno 22] Invalid argument" with buffered rw
file IO
https://bitbucket.org/pypy/pypy/issue/1902/pypy3-ioerror-errno-22-invalid-argument
Christoph Reiter:
With PyPy 2.4.0:
```
#!python
with open("foo.data", "w+b", 4096) as f:
f.write(b"\xff" * 13569)
f.flush()
f.seek(0, 0)
f.read(1)
f.seek(-1, 1)
f.write(b"") # pypy3: IOError: [Errno 22] Invalid argument
```
```
#!python
with open("foo.data", "w+b", 4096) as f:
f.write(b"\xff" * 13569)
f.flush()
f.seek(0, 0)
f.read(1)
f.seek(-1, 1)
f.write(b"\xff")
f.seek(1, 0)
f.read(4123)
f.seek(-4123, 1) # IOError: [Errno 22] Invalid argument
```
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