I cannot create a contact without email duplication and with lead_source_id.
https://api.infusionsoft.com/crm/rest/v1/contacts/?access_token=___TOKEN___` resulted in a `400 Bad Request` response:
{"message":"Unrecognized property: duplicate_option"}
https://api.infusionsoft.com/crm/rest/v1/contacts/?access_token=___TOKEN___` resulted in a `400 Bad Request` response:
{"message":"Lead Source Id is invalid"}
Before setting lead_source_id I check it and it is a valid contact_id.
If I use XML_RPC, the LeadSourceId is not saved.