Handle `NaN` values too

[bedilbek]

Expected

cat <<EOF > sample.json | jq . 
{
  "key": NaN 
}
EOF
{
  "key": null
}

Actual

cat <<EOF > sample.json | jaq .
{
  "key": NaN 
}
EOF
Error: failed to parse: value expected

Could you also handle this case? This kind of use case typically occurs when I use Python's default JSON encoder for numpy.nan values. Example:

uv run --with numpy~=2.3.2 python -c 'import numpy as np; import json; print(json.dumps(np.nan))'
NaN