Bulk-uploading of custom fields via bulk_fields breaks when values (and, presumably keys) include a colon. Would it be possible to add a means of escaping such characters, e.g. with a backslash or by URL-encoding? If something of the kind is already available (I did try backslash-escaping with no success), please add it to the API docs.
Mostly, it would make large updates a lot faster by reducing the number of individual HTTPS requests.
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