An object with a binary field type will throw a fatal error and loose the value when updating using the API.

test case:

• in admin backend, create a "file" object, with any file(.pdf, .zip, etc)
• update the object using the API (see the example file attached)
• update will fail with a fatal error.
• in admin, check that a new "draft" is there
• using compare versions, check that the "file" field was lost