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Push a key onto the stack.
void push_key( string_view s);
          This function notionally removes all the characters currently on the stack,
          then pushes a value containing a key onto the
          stack formed by appending s
          to the removed characters.
        
          Basic guarantee. Calls to memory_resource::allocate
          may throw.
        
| Name | Description | 
|---|---|
| 
                     | The characters to append. This may be empty. |