Spreadsheets exported from some third-party tools store integer IDs as decimals, so a customer ID like 8763573043354 comes back as 8763573043354.0. Those imports now work as expected.
Fixes#
- Trailing .0 on IDs - Numeric Shopify ID columns (Customer: ID, Line: Product ID, Line: Variant ID, Transaction: ID, and others) are normalized on import, so round-tripped files no longer fail with non-numeric ID errors.

