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Insert a field.
void insert( string_view name, string_view const& value);
If one or more fields with the same name already exist, the new field will be inserted after the last field with the matching name, in serialization order.
| Name | Description | 
|---|---|
| 
                       | The field name. | 
| 
                       | 
                      The value of the field, as a  |