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Constructor.
template< class... Args> key_value_pair( string_view key, Args&&... args);
This constructs a key/value pair.
            Strong guarantee. Calls to memory_resource::allocate
            may throw.
          
| Name | Description | 
|---|---|
| 
                       | The key string to use. | 
| 
                       | 
                      Optional arguments forwarded to the  |