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            Return a reference to the underlying std::uint64_t,
            or throw an exception.
          
std::uint64_t& as_uint64();
            If is_uint64()
            is true, returns a reference
            to the underlying std::uint64_t,
            otherwise throws an exception.
          
Constant.
Strong guarantee.
| Type | Thrown On | 
|---|---|
| 
                       | 
                       |