Function encoder

test/stringify.js:1280–1288

(str, defaultEncoder, charset, type)

    t.test('allows for encoding keys and values differently', function (st) {
        var encoder = function (str, defaultEncoder, charset, type) {
            if (type === 'key') {
                return defaultEncoder(str, defaultEncoder, charset, type).toLowerCase();
            }
            if (type === 'value') {
                return defaultEncoder(str, defaultEncoder, charset, type).toUpperCase();
            }
            throw 'this should never happen! type: ' + type;
        };

        st.deepEqual(qs.stringify({ KeY: 'vAlUe' }, { encoder: encoder }), 'key=VALUE');