IronLanguages / IronLanguages/ironpython3
Formatting issues
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- Dominant language
- C#
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Description
%-formatting of 999999999999998 is busted (outputs f-1) on .NET Framework (because it's rounding up to 1000000000000000 and the formatting logic fails to handle that properly).
assert "%.15g" % 999999999999998 == "999999999999998"
The "new-style" formatting is also failing, but with a ValueError:
assert f"{999999999999998:.15g}" == "999999999999998"
ValueError: Precision not allowed in integer format specifier
Contributor guide
First steps
- Read the whole issue, then the project's contributing guide.
- Comment on the issue to say you are picking it up — it saves two people doing the same work.
- Fork the repository and make your change on a branch.
- Open a pull request that references the issue number.
Research direction
Start by reproducing the two assertions on .NET Framework, then trace the %-formatting and new-style formatting paths for numeric values near 1000000000000000. Done means both examples produce "999999999999998" without an exception.
Written by the indexing model from the issue text.
Assessment
- Tech stack
- csharp, python
- Domain
- compilers
- Issue type
- Bug
- Difficulty
- 3/5
- Estimated time
- 1-2 days
- Activity status
- Stale
- Clarity
- Mostly clear
- Newbie friendliness
- 45/100