Performed full review of c3ec0bb...0fe46ad

Analysis

1. The implementation lacks sufficient validation and error handling for the new optional Country parameter, which could lead to unexpected behavior when the parameter is omitted.

2. While backward compatibility is maintained from a syntactic perspective, there's no clear documentation of the semantic implications of omitting the Country parameter - what defaults are used and how this affects routing behavior.

3. The SDK version bump from v0.15.0 to v0.17.0 may introduce additional dependencies or changes that aren't directly related to this feature, potentially increasing upgrade risk.

4. Although test coverage includes both old and new behavior scenarios, it's unclear if edge cases (such as invalid country codes or runtime failures) are adequately tested in the optional parameter context.

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