BUG: values array for non-unique, interleaved cols incorrect #4460
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I came across this problem when I was doing some work for #4362. When a frame with mixed dtypes including Timestamps has dupe column labels the values array returned is different, as illustrated below (master branch):
The included changes should fix the problem. This is my first time messing about in pandas internals so any feedback is appreciated!
Possibly related to #4377