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Niels Lohmann
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With JSON_USE_LEGACY_DISCARDED_VALUE_COMPARISON=1 and C++20, a scalar on the left-hand side of <= or >= (e.g., `1 <= discarded`) yielded false instead of the documented true. The C++20 legacy block only had member operators, which are only candidates when the basic_json is the left operand; for a scalar on the left, overload resolution picked the candidate rewritten from operator<=>, which does not emulate the legacy behavior. The C++17 branch already has scalar-on-the-left friend overloads for <= and >=; add the equivalent pair to the C++20 legacy block. Added a regression test to tests/src/unit-comparison.cpp covering all four operand orders for both operators. Fixes #5665. Signed-off-by: Niels Lohmann <mail@nlohmann.me>
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