string infinity values get parsed as number instead of as string

[m-mohr]

A process such as

{
        "process_graph": {
            "node": {
                "process_id": "is_infinite",
                "arguments": {
                    "x": "+inf"
                },
                "result": true,
            }
        }
    }

returns true because in Python you can actually parse these strings into floats (i.e. float('+inf') is infinity. This is not valid according to the spec. The parser should keep "+inf" and similar values as a string.

I'm also wondering whether string numerical values like '1.23' get converted into numbers although they should be strings...

I guess it may help to create a custom float class that doesn't allow passing in these string values: https://stackoverflow.com/questions/25022079/extend-python-build-in-class-float