Pass `parallelism` via CLI? Error on string vs int

Is it possible to pass in parallelism via the command line?

I tried to setup a parameter to do this, but got an error about the value not being a number.

```
Failed to parse workflow:
error unmarshaling JSON: while decoding JSON: json:
cannot unmarshal string into Go struct field WorkflowSpec.parallelism of type int64
```

If it's not possible by default to set this for the workflow from the command line, is there a way of coercing a string containing a number into a number?

**Edit**: Do you have [anything like an `int` filter](https://stackoverflow.com/a/28234670)? I heard you were using Jinja but I can't find it within the codebase.

Start by tracing CLI parameter handling and JSON unmarshalling for WorkflowSpec.parallelism, then check whether the codebase provides the Jinja or int-filter support mentioned in the issue. Done means establishing and documenting a supported way to pass a numeric parallelism value, or clearly defining that the capability is not supported.

Written by the indexing model from the issue text.