Issue description

When I passing url like /api/xxx?age=123&name=123&a=2&a=1
this should be sorted as a=1&a=2&age=123&name=123
but I got a=2&a=1&age=2&name=1

Environment

• apisix version (cmd: apisix version):
• OS (cmd: uname -a):
• OpenResty / Nginx version (cmd: nginx -V or openresty -V):
• etcd version, if have (cmd: run curl http://127.0.0.1:9090/v1/server_info to get the info from server-info API):
• apisix-dashboard version, if have:
• the plugin runner version, if the issue is about a plugin runner (cmd: depended on the kind of runner):
• luarocks version, if the issue is about installation (cmd: luarocks --version):

Steps to reproduce

same as description

Actual result

same as description

Error log

same as description

Expected result

No response