buffer creates only read-only buffer?
m = mmap.mmap (fd, 64, prot=mmap.PROT_READ|mmap.PROT_WRITE, flags=mmap.MAP_SHARED)
b2 = buffer (m)
<read-only buffer for 0x110cae0, size -1, offset 0 at 0x10fd8f0>
Why read-only? Why doesn't 'buffer' allow creation of read-write? Should buffer constructor take an additional optional arg for specifying this? Doc doesn't say anything about the fact that it's read only.
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