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Clarify fread header detection with keepLeadingZeros (#5405)#7809

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venom1204 wants to merge 3 commits into
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issue5405
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Clarify fread header detection with keepLeadingZeros (#5405)#7809
venom1204 wants to merge 3 commits into
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issue5405

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@venom1204

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closes #5405
in this pr i
updated documentation and vignette to explain that keepLeadingZeros = TRUE can trigger header = "auto" by converting numeric columns to characters.

@venom1204 venom1204 requested a review from MichaelChirico as a code owner July 8, 2026 17:47
@venom1204 venom1204 changed the title added doc Clarify fread header detection with keepLeadingZeros (#5405) Jul 8, 2026
@venom1204 venom1204 requested review from joshhwuu and tdhock July 8, 2026 17:53
Comment thread NEWS.md Outdated

7. Verbose outputs from `frolladaptivefun()` and `frollfun()` are now clearer and more user friendly [#7021](https://github.com/Rdatatable/data.table/issues/7021). Thanks to @Omartech312, @aidengseay, @kkarissa, and @heb229 for the implementation, to @ben-schwen for the review, and to @jangorecki for the extensive guidance and review.

8. Clarified `fread()` documentation and vignette regarding the interaction between `keepLeadingZeros = TRUE` and automatic header detection, [#5405](https://github.com/Rdatatable/data.table/issues/5405). Thanks @clemenskuehn for the report.

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ok but who changed it?

@ben-schwen ben-schwen left a comment

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LGTM besides missing contributor

@venom1204 venom1204 requested a review from ben-schwen July 10, 2026 18:49
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keepLeadingZeros = TRUE can change header behavior

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