Updating item returns "Invalid request, probably due to unsupported parameters" about pyzotero HOT 4 OPEN

I have no idea why this is failing – it's working fine for non-attachment items, and the JSON it's sending is valid. I'll ask on the mailing list.

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Adding a link to the mailing list discussion, as this is apparently an API limitation: https://groups.google.com/forum/?fromgroups#!topic/zotero-dev/cpTuzyp-keY

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This issue is still open on the Zotero side: zotero/dataserver#1

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Quick note -- for those still encountering this problem:

myitem = zot.item('KCP87MZI')                                                                                                              

zot.update_item( myitem )          # This fails
zot.update_item( myitem['data'] )  # This updates fine

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