JSONType parameter not converted to object on argo (Metaflow >=2.12.23)

[chrschorn]

Hey, I noticed that JSONType does not convert parameters to objects on argo. Instead the params remain strings.

• With python testflow.py run --param '["test"]', self.param is of type list
• With python testflow.py argo-workflows trigger --param '["test"]' the param is of type str

This issue might've been introduced with 2.12.23:

• 2.14.0: param is str
• 2.12.23: param is str
• 2.12.22: param is list

Test flow:

from metaflow import JSONType, Parameter, kubernetes, project, step, FlowSpec

@project(name="test")
class TestFlow(FlowSpec):
    param = Parameter("param", type=JSONType)

    @kubernetes()
    @step
    def start(self):
        print(self.param)
        # <class 'str'> on argo, <class 'list'> via run
        print(type(self.param)) 
        self.next(self.end)

    @kubernetes()
    @step
    def end(self):
        pass


if __name__ == "__main__":
    TestFlow()