💡 Motivation and Context

Feature flag APIs should accept Ruby symbols for flag keys as well as strings. Previously, symbol keys could miss local and remote flag lookups because SDK internals compared them directly against string keys.

This normalizes flag keys to strings across the flag APIs, including legacy single-flag methods, remote config payloads, and evaluate_flags(flag_keys:).

Review loop: checked the SDK diff against compatibility, API surface, entry-point tracing, performance, coverage, and error-handling criteria; no follow-up fixes were needed after the review.

💚 How did you test it?

• bundle exec rspec
• bundle exec rubocop

📝 Checklist

• I reviewed the submitted code.
• I added tests to verify the changes.
• I updated the docs if needed.
• No breaking change or entry added to the changelog.

If releasing new changes

• Ran pnpm changeset to generate a changeset file