Compilation fails on BSONObjBuilder when one of the arguments is of uint64_t type.

Example:

uint64_t val;
BSONObj b = BSON("key" << val);

Error produced:

<...>/mongo/client/../util/net/../../db/../bson/bson-inl.h: In member function 'mongo::BSONObjBuilder& mongo::BSONObjBuilderValueStream::operator<<(T) [with T = long unsigned int]':
<...>/mongo/client/../util/net/../../db/../bson/bson-inl.h:341: error: call of overloaded 'append(const char*&, long unsigned int&)' is ambiguous