CXX-588 Cannot use kvp() with a std::string param #291
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sub_document.append() specializations for std::string and
stdx::string_view keyed tuples fail to forward for the various cv and
ref qualified variants. To keep up the perfect forwarding, these
functions need to take the key type as a template type parameter and
SFINAE themselves to disambiguate.
Credit: @hanumantmk, see PR #281