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(well what you are doing below)","created_at":"2016-02-17T00:33:05Z","updated_at":"2016-02-17T00:33:05Z","html_url":"https://github.com/pydata/pandas/pull/12359#discussion_r53104482","pull_request_url":"https://api.github.com/repos/pydata/pandas/pulls/12359","_links":{"self":{"href":"https://api.github.com/repos/pydata/pandas/pulls/comments/53104482"},"html":{"href":"https://github.com/pydata/pandas/pull/12359#discussion_r53104482"},"pull_request":{"href":"https://api.github.com/repos/pydata/pandas/pulls/12359"}}},"pull_request":{"url":"https://api.github.com/repos/pydata/pandas/pulls/12359","id":59575098,"html_url":"https://github.com/pydata/pandas/pull/12359","diff_url":"https://github.com/pydata/pandas/pull/12359.diff","patch_url":"https://github.com/pydata/pandas/pull/12359.patch","issue_url":"https://api.github.com/repos/pydata/pandas/issues/12359","number":12359,"state":"open","locked":false,"title":"ENH: always make ndarrays from msgpack writable","user":{"login":"llllllllll","id":3064397,"avatar_url":"https://avatars.githubusercontent.com/u/3064397?v=3","gravatar_id":"","url":"https://api.github.com/users/llllllllll","html_url":"https://github.com/llllllllll","followers_url":"https://api.github.com/users/llllllllll/followers","following_url":"https://api.github.com/users/llllllllll/following{/other_user}","gists_url":"https://api.github.com/users/llllllllll/gists{/gist_id}","starred_url":"https://api.github.com/users/llllllllll/starred{/owner}{/repo}","subscriptions_url":"https://api.github.com/users/llllllllll/subscriptions","organizations_url":"https://api.github.com/users/llllllllll/orgs","repos_url":"https://api.github.com/users/llllllllll/repos","events_url":"https://api.github.com/users/llllllllll/events{/privacy}","received_events_url":"https://api.github.com/users/llllllllll/received_events","type":"User","site_admin":false},"body":"Addresses the case where 'compress' was not none. The old implementation\r\nwould decompress the data and then call np.frombuffer on a bytes\r\nobject. Because a bytes object is not a mutable buffer, the resulting\r\nndarray had writeable=False. The new implementation ensures that the\r\npandas is the only owner of this new buffer and then sets it to mutable\r\nwithout copying it. This means that we don't need to do a copy of the\r\ndata coming in AND we can mutate it later. If we are not the only owner\r\nof this data then we just copy it with 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