API/PERF: restore auto-boxing on isnull/notnull for Series (w/o copy) preserves perf gains#5159

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jreback merged 1 commit intopandas-dev:masterfrom

jreback:isnull_box

Oct 8, 2013

Commits on Oct 8, 2013

API/PERF: restore auto-boxing on isnull/notnull for Series (w/o copy) preservers perf gains
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