>>> errcode $CLI bundle validate --var a=one -o json

Exit code: 0
{
  "a": {
    "default": "hello",
    "value": "one"
  }
}

>>> errcode $CLI bundle validate --var a=one --var a=two
Error: failed to assign two to a: variable has already been assigned value: one

Name: arg-repeat
Target: default

Found 1 error

Exit code: 1