Return the non-modifiable string representation corresponding to the specified enumeration value, if it exists, and a unique (error) string otherwise. The string representation of value matches the first 3 characters of its corresponding enumerator name with the "e_" prefix elided. For example: ` bsl::cout << ball::UserFieldType::toAscii( ball::UserFieldType::e_STRING); ` will print the following on standard output: ` STRING ` Note that specifying a value that does not match any of the enumerators will result in a string representation that is distinct from any of those corresponding to the enumerators, but is otherwise unspecified.