deploy: 40a62947d3

api/basic_json/to_bon8/index.md

@@ -35,6 +35,7 @@ Strong guarantee: if an exception is thrown, there are no changes in the JSON va
 
 - Throws [out_of_range.407](https://json.nlohmann.me/home/exceptions/#jsonexceptionout_of_range407) if `j` contains an unsigned integer above 9223372036854775807, which BON8 cannot represent
 - Throws [type_error.316](https://json.nlohmann.me/home/exceptions/#jsonexceptiontype_error316) if `j` contains a string that is not valid UTF-8
+- Throws [type_error.321](https://json.nlohmann.me/home/exceptions/#jsonexceptiontype_error321) if `j` or a value nested in it is discarded; example: `"cannot serialize discarded value to BON8"`
 
 ## Complexity