Unable to decode optional vector

[jnordberg]

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The following is valid code according to eosio-cpp and compiles and executes fine but nodeos chokes when trying to use the ABI generated

using namespace std;

[[eosio::action]] void foo(optional<vector<string>> accounts) { .. }

Error 3015004: The type defined in the ABI is invalid
Error Details:
string[]?
Stack Trace:
abi_serializer.cpp:288 validate
abi_serializer.cpp:289 validate
abi_serializer.cpp:290 validate