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Philipp MoritzWes McKinney
af167fdcda9
Philipp Moritz authored and Wes McKinney committed c905783fd6b
ARROW-1625: [Serialization] Support OrderedDict and defaultdict serialization

This PR adds support for OrderedDicts and default dicts using custom serialization handlers.

Author: Philipp Moritz <pcmoritz@gmail.com>

Closes #1152 from pcmoritz/pydict-exact2 and squashes the following commits:

431e0272 [Philipp Moritz] make cloudpickle optional
052b1aa9 [Philipp Moritz] I'd prefer this not to be a runtime dependency
db19ab9b [Philipp Moritz] add tests
799d983e [Philipp Moritz] do not interpret OrderedDict as dict