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50b09bbe9735c889a9c815eddcee6715ebe848da by Yuan Chai <350365422@qq.com>:
fix: improve json serialization by allowing non-ascii characters
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c66977ae6ec4edc71a2d633eb09918eb2a226461 by Yuan Chai <350365422@qq.com>:
fix: serialize function call arguments to JSON string
Previously accepted JSON objects directly, which was less robust. Now serialize arguments to JSON strings using `_safe_json_serialize`, ensuring stability and handling non-ASCII characters correctly.
COPYBARA_INTEGRATE_REVIEW=https://github.com/google/adk-python/pull/605 from nauyiahc:fix_non_ascii_char a52513c5747296b717acee989684324e1b072d34
PiperOrigin-RevId: 764396496