Rounding of floats

[goodevilgenius]

Floats are rounded very poorly in jshon.

E.g., echo [0.3] | jshon outputs:

[
 0.29999999999999999
]

[jmetzmeier]

That's not rounding, that's 0.3 represented as a float.

$ python -c 'print format(0.3, ".20f")'
0.29999999999999998890

[goodevilgenius]

It's still a bug. 0.29999999999999999 ≠ .3

[milhnl]

No it is not. It is literally how floats work. https://en.wikipedia.org/wiki/Floating_point#Accuracy_problems

[Nindaleth]

Even if that is literally how floats work, let me demonstrate how other JSON processing tools seem not to mind:

$ echo [0.3] | jq
[
  0.3
]

$ python -c "import json; print(json.dumps([0.3]))"
[0.3]

It's not that unreasonable to expect that same result from another JSON tool.