Example from README fails

[vikmary]

Hi Dmitriy!

Unfortunately, the following example fails for me.

import fast_json
from collections import namedtuple


MyType = namedtuple("MyType", ["name", "value"])


@fast_json.convert.register(MyType)
def _(value):
    return "name={0.name} value={0.value}".format(value)


print(
    fast_json.dumps({
        "one": MyType(name="foo", value="bar")
    })
)

outputs {"one": ["foo", "bar"]}

This might be due to new code in json for Python 3.8 https://github.com/python/cpython/blob/3.8/Lib/json/encoder.py

You might want to update python_requires='<=3.7 in setup.py, or adapt to new code.

The problem in new json realization might be that default method gets invoked only if general parsing failed (but it doesn't fail for namedtuples).

Thank you!