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            Return a reference to the underlying std::int64_t,
            or throw an exception.
          
std::int64_t& as_int64();
            If is_int64()
            is true, returns a reference
            to the underlying std::int64_t,
            otherwise throws an exception.
          
Constant.
Strong guarantee.
| Type | Thrown On | 
|---|---|
| 
                       | 
                       |