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505715ddf1
For now, on a small rails app I have hanging around:
```
==> memprof.after.txt <==
Total allocated: 872.51 MB (465330 objects)
Total retained: 40.48 kB (326 objects)
==> memprof.before.txt <==
Total allocated: 890.79 MB (1494026 objects)
Total retained: 40.40 kB (328 objects)
```
Not a huge difference in memory usage, but it's a drastic improvement
in total number of allocations.
Additionally, this will pay huge dividends once
https://github.com/ruby/zlib/pull/61 is merged, as it will allow us to
completely avoid allocations in the repeated calls to readpartial,
which currently accounts for most of the memory usage shown above.
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