Overload set ci_is_equal

template<
    class String0,
    class String1>
std::enable_if<!std::is_convertible<String0, core::string_view>::value || !std::is_convertible<String1, core::string_view>::value, bool>::type
ci_is_equal(
    const String0& s0,
    const String1& s1);
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bool
ci_is_equal(
    core::string_view s0,
    core::string_view s1) noexcept;
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