## Description
**Steps to reproduce (step by step instructions, with links, commands and necessary data to reproduce the error)**
# Go to the API sandbox, and call `wikilambda_function_call` with the following zobject:
```
{
"Z1K1": "Z7",
"Z7K1": "Z801",
"Z801K1": [
"Z6",
"abc",
"def"
]
}
```
**Observed behavior**
* Z22K1 in the response looks like this:
```
"Z22K1": [
{
"Z1K1": "Z4",
"Z4K1": "Z6",
"Z4K2": [
"Z3",
{
"Z1K1": "Z3",
"Z3K1": "Z6",
"Z3K2": "Z6K1",
"Z3K3": {
"Z1K1": "Z12",
"Z12K1": [
"Z11",
{
"Z1K1": "Z11",
"Z11K1": "Z1002",
"Z11K2": "value"
}
]
}
}
],
"Z4K3": "Z106"
},
"abc",
"def"
]
```
* Note that the first element of the list is not simply `"Z6"`, but a fully expanded definition of Z6.
* This causes problems when Echo is called in `wikilambda_perform_test`: unlike `wikilambda_function_call`, this path validates the response received from the Orchestrator, and throws an exception saying "Key value not wellformed". If the Orchestrator's response is altered to have `"Z6"` as the first element, no exception is thrown.
**Expected behavior/Acceptance criteria (returned value, expected error, performance expectations, etc.)**
* `"Z6"` as first element.
## Completion checklist
* [ ] Before closing this task, review one by one the checklist available here: https://www.mediawiki.org/wiki/Abstract_Wikipedia_team/Definition_of_Done#Back-end_Task/Bug_completion_checklist