Printing an `Integer` as hex appends an 'h'

If I do this: 

std::uint64_t x = 100;
std::cout << std::hex << x;

The output is: 64

If I instead do this:

CryptoPP::Integer x1 = 100;
std::cout << std::hex << x1;

The output is: 64h

From where is this "h" coming and how do I get rid of it?

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