The documentation says, in the Available fields and field structure section, that "if there is only one name for the contributor, the second value [representing last name of two-field creators] will be an empty string". However, in the following two examples returning one-field contributors it is the first value (not the second) which is an empty string:
- https://clinicaltrials.gov/ct2/show/NCT04292899
- http://observationalepidemiology.blogspot.com/2011/10/tweet-from-matt-yglesias.html
This aligns with Zotero behavior of saving one-field creator names into the lastName field. Shall we change the docs?