Array parameters in model runtime

[greg-wiltshire]

Bug Report

Steps to Reproduce:

tracdap-runtime 0.5.28

When setting a default value for a parameter which is an array of strings:

string_list_type = trac.TypeDescriptor(trac.BasicType.ARRAY, arrayType=trac.TypeDescriptor(trac.BasicType.STRING))
trac.P("string_list_with_default", string_list_type, label="List of strings with default", default_value=["a", "b", "c"])

and when not setting a default, but setting the value from the local config:

string_list_without_default: ["A", "B", "C"]

Expected Result:

Execution of a model in an IDE runs without error

Actual Result:

The two examples above both cause the separate errors below. First default array values can not be set:

Traceback (most recent call last):
  File "...\tracdap\rt\_impl\models.py", line 196, in scan_model
    parameters = model.define_parameters()
  File "...\test_models\src\testing_models\test_model_a.py", line 45, in define_parameters
    trac.P("string_list_with_default", string_list_type, label="List of strings with default", default_value=["a", "b", "c"]),
  File "...\test_models\venv\lib\site-packages\tracdap\rt\api\static_api.py", line 191, in P
    return declare_parameter(
  File "...\test_models\venv\lib\site-packages\tracdap\rt\api\static_api.py", line 170, in declare_parameter
    return define_parameter(param_name, param_type, label, default_value)
  File "...\test_models\venv\lib\site-packages\tracdap\rt\api\static_api.py", line 148, in define_parameter
    return sa.define_parameter(param_name, param_type, label, default_value)
  File "...\test_models\venv\lib\site-packages\tracdap\rt\_impl\static_api.py", line 85, in define_parameter
    default_value = _type_system.MetadataCodec.encode_value(default_value)
  File "...\test_models\venv\lib\site-packages\tracdap\rt\_impl\type_system.py", line 174, in encode_value
    raise _ex.ETracInternal(f"Value type [{type(value)}] is not supported yet")
tracdap.rt.exceptions.ETracInternal: Value type [<class 'list'>] is not supported yet

Second, values can not be set via local config:

Traceback (most recent call last):
  File "...\testing_models\test_model_a.py", line 100, in <module>
    launch.launch_model(Wrapper, "config/test_models/test_model_a.yaml", "config/sys_config.yaml")
  File "...\test_models\venv\lib\site-packages\tracdap\rt\launch\launch.py", line 91, in launch_model
    job = runtime_instance.load_job_config(_job_config, model_class=model_class)
  File "...\test_models\venv\lib\site-packages\tracdap\rt\_exec\runtime.py", line 256, in load_job_config
    job_config = job_config_parser.parse(job_config_raw, job_config_path)
  File "...\test_models\venv\lib\site-packages\tracdap\rt\_impl\config_parser.py", line 147, in parse
    raise _ex.EConfigParse(message)
tracdap.rt.exceptions.EConfigParse: Errors found in config file [...\test_models\config\test_models\test_model_a.yaml]
Expected type Value, got '['A', 'B', 'C']' (in job.runModel.parameters.string_list_without_default)