API/PERF: restore auto-boxing on isnull/notnull for Series (w/o copy) preserves perf gains #5159
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… preservers perf gains
jreback
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Oct 8, 2013
API/PERF: restore auto-boxing on isnull/notnull for Series (w/o copy) preserves perf gains
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restore API before #5154
boxing via null/isnull is same as 0.12
(aside from now
isnull/notnullare now available onNDFrameobjs as well)