v0.1.0

Initial release.

Exported fork of cloud.google.com/go/internal/fields as of cloud.google.com/go v0.121.4, the struct field-listing implementation shared by the spanner, bigquery, datastore, and firestore client libraries (embedded-field flattening with Go's shadowing rules, tag dominance, case-insensitive matching).

• Package name stays fields; diffs against upstream are minimal (provenance headers, a local cmp.Equal shim replacing internal/testutil in tests).
• The sole purpose of this module is to fork and export that internal package; behavioral mirrors built on top (such as spanenc) live in their own modules.
• License: Apache-2.0 (upstream Copyright Google LLC).