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API page: https://api.drupal.org/api/drupal/modules%21field%21field.crud.inc/funct...
Please see my comment here for details:
https://api.drupal.org/comment/52778#comment-52778
Comments
Comment #1
jhodgdonYes, it's definitely a bug. It has already been reported in:
#2054189: 'definition' key does not exist in the array returned by field_info_instance(). Update docs.