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https://github.com/wpilibsuite/allwpilib
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f0b484892c
This fixes the following warning.
The member function operator== only works in C++17, and the friend operator== only works in C++20.
```
/Users/runner/.gradle/caches/transforms-2/files-2.1/c671f5a5dff922b8870f4eb33f4c8e2a/wpiutil-cpp-2022.1.1-alpha-3-1-g4e3fd7d-headers/wpi/json.h:1847:46: warning: ISO C++20 considers use of overloaded operator '==' (with operand types 'const typename json::object_t::iterator' (aka 'const StringMapIterator<wpi::json>') and 'const typename json::object_t::iterator') to be ambiguous despite there being a unique best viable function [-Wambiguous-reversed-operator]
return (m_it.object_iterator == other.m_it.object_iterator);
~~~~~~~~~~~~~~~~~~~~ ^ ~~~~~~~~~~~~~~~~~~~~~~~~~~
/Users/runner/.gradle/caches/transforms-2/files-2.1/c671f5a5dff922b8870f4eb33f4c8e2a/wpiutil-cpp-2022.1.1-alpha-3-1-g4e3fd7d-headers/wpi/json.h:1863:20: note: in instantiation of member function 'wpi::detail::iter_impl<const wpi::json>::operator==' requested here
return not operator==(other);
^
/Users/runner/.gradle/caches/transforms-2/files-2.1/c671f5a5dff922b8870f4eb33f4c8e2a/wpiutil-cpp-2022.1.1-alpha-3-1-g4e3fd7d-headers/wpi/json.h:5008:20: note: in instantiation of member function 'wpi::detail::iter_impl<const wpi::json>::operator!=' requested here
if (it != end())
^
/Users/runner/.gradle/caches/transforms-2/files-2.1/c671f5a5dff922b8870f4eb33f4c8e2a/wpiutil-cpp-2022.1.1-alpha-3-1-g4e3fd7d-headers/wpi/json.h:5025:16: note: in instantiation of function template specialization 'wpi::json::value<std::basic_string<char>, 0>' requested here
return value(key, std::string(default_value));
^
/Users/runner/.gradle/caches/transforms-2/files-2.1/c671f5a5dff922b8870f4eb33f4c8e2a/wpiutil-cpp-2022.1.1-alpha-3-1-g4e3fd7d-headers/wpi/StringMap.h:442:8: note: ambiguity is between a regular call to this operator and a call with the argument order reversed
bool operator==(const DerivedTy &RHS) const { return Ptr == RHS.Ptr; }
^
```