mmap only supports string

[Neal Becker]

Problem is, AFAIK a string can only be created as a copy of some other data.  Say I'd like to take some large object and read/write to/from mmap object.  A good way to do this would be the buffer protocol.  Unfortunately, mmap only supports string.  A string could only be created after copying the original object AFAIK.

I think mmap should work directly with buffer protocol, so it could directly read/write with objects supporting buffer protocol.  Specifically, mmap slice should support buffer protocol.