I'm working on litecoin testnet and I have a long list of unspent transactions who's returned by listunspent RPC.
When I'm calling it more then once the memory does not free and consuming more memory with each call.

Expected behavior
UniValue will release its memory.

Actual behavior

Memory increased.

To reproduce

Run listunspent multiple times.

System information
OS: Ubuntu/CentOS
I'm using litecoin core v0.18.1, but it's happened at previous versions(v0.15.1, v0.16.1)