Constructor.

query_param();
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query_param(
    query_param_view const& v);
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query_param(
    query_param_encoded_view const& v);
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query_param(
    pct_encoded_view const& key_,
    pct_encoded_view const& value_,
    bool has_value_);
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query_param(
    string_view const& key_,
    string_view const& value_,
    bool has_value_);
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