check if key in self._object_class_keys

[scottcarr]

It's possible for key to be either "objectClass" or b"objectClass". Other places use this self._object_class_keys to handle this scenario.

[codecov[bot]]

Codecov Report

Merging #220 (b9cdd0a) into master (df81510) will not change coverage. The diff coverage is 100.00%.

:exclamation: Current head b9cdd0a differs from pull request most recent head 8e5a9e8. Consider uploading reports for the commit 8e5a9e8 to get more accurate results

@@           Coverage Diff           @@
##           master     #220   +/-   ##
=======================================
  Coverage   83.28%   83.28%           
=======================================
  Files          87       87           
  Lines       11567    11567           
  Branches     1184     1184           
=======================================
  Hits         9634     9634           
  Misses       1815     1815           
  Partials      118      118           

Impacted Files	Coverage Δ
ldaptor/protocols/ldap/ldapsyntax.py	94.24% <100.00%> (ø)
ldaptor/test/test_autofill_samba.py	100.00% <0.00%> (ø)
ldaptor/protocols/ldap/distinguishedname.py	89.09% <0.00%> (ø)

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