Cannot import zero (0) value into custom attribute

[gwilliams01]

When using the Admin product import feature it is not possible to import a zero (0) value into custom attribute field. Instead the value is unchanged.

Preconditions

Magento 2.1.9

Steps to reproduce

1. Create custom attribute using Text Field input type
2. Create product import CSV with "additional_attributes" column populated "custom_attribute_code=0"
3. Import - Entity Type "Products" - Import Behaviour "Add/Update (all others default)
4. "Check Data" - No errors
5. Click "Import" button

Expected result

1. Product "custom_attribute_code" should be updated with zero (0) value

Actual result

1. Product "custom_attribute_code" does not change

[magento-engcom-team]

@gwilliams01, thank you for your report.
We've created internal ticket(s) MAGETWO-83453 to track progress on the issue.