Improve error message oriented from JS object #2829
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`JsValue.as_string` converts the value to String iff the value is a String itself, so the error message always failovers to empty string. `JsValue` impls `Debug` using `JSON.stringify`, and it gives better description of the error.
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Description
JsValue.as_stringconverts the value to String iff the value is aString itself, so the error message always failovers to empty string.
JsValueimplsDebugusingJSON.stringify, and it gives betterdescription of the error.
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