Overload set param::param

param() = default;
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param(param&& other) noexcept;
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param(const param& other) = default;
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template<class OptionalString>
param(
    string_view key,
    const OptionalString& value);
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param(
    string_view key,
    string_view value,
    bool has_value) noexcept;
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