Backport PR #35852 on branch 1.1.x (API: replace dropna=False option with na_sentinel=None in factorize)

[meeseeksmachine]

Backport PR #35852: API: replace dropna=False option with na_sentinel=None in factorize

[jreback]

@charlesdong1991 and can merge this when green as well

[simonjayhawkins]

@charlesdong1991 and can merge this when green as well

and when merging on the backport branch ensure that Co-authored-by: Kaiqi Dong [email protected] or whoever the author is is included otherwise they won't appear in the contributors list

[charlesdong1991]

may I kindly ask how to check if the author is included in this case? 😅 @simonjayhawkins

[simonjayhawkins]

when you click on confirm squash and merge you'll see

so the the co-author is included automatically. just need to ensure that if cleaning the description that you don't remove the co-author (i.e. the original author)

[charlesdong1991]

yep, get it! thanks very much! @simonjayhawkins