Small doubles are serialized incorrectly by fwrite
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Assessment
- Difficulty
- 3/5
- Estimated time
- 1-2 days
- Newbie friendliness
- 38/100
Research direction
Start at the fwrite entry point and reproduce the issue with a data.table containing A=1e-323. Trace how this very small double is converted for output, then verify that the serialized value preserves the input within the expected floating-point precision.
Written by the indexing model from the issue text.
Description
> # This is correct, up to some unavoidable loss in precision
> data.table(A=1e-323)
A
1: 9.881313e-324
> # But this is not
> fwrite(data.table(A=1e-323))
A
1.1125369292536e-308
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