REF: implement first_valid_index in core.missing#29400

Merged

jreback merged 3 commits intopandas-dev:masterfrom

jbrockmendel:ref-algos

Nov 5, 2019

Commits on Nov 4, 2019

REF: avoid core.missing dependency on Series
jbrockmendel
committed
Merge branch 'master' of https://github.com/pandas-dev/pandas into ref-algos
jbrockmendel
committed
Merge branch 'master' of https://github.com/pandas-dev/pandas into ref-algos
jbrockmendel
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