fix: honor precision when a width is set in ByteSize Display - #178
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robjtede merged 1 commit intoJul 31, 2026
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With a width, the Display impl used f.pad(display.to_string()). That
renders at the default precision and then f.pad treats the precision as
a maximum width, so a value like ByteSize::mib(1908) formatted with
{:>12.5} came out as " 1.9 G" - the precision ignored and the
unit truncated. Render with the requested precision first, then apply
only the width, fill, and alignment.
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very subtle, nice one, thanks 👍🏻
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When a
ByteSizeis formatted with a width, precision is dropped and the value can be truncated mid-unit:The width branch of
Displaydoesf.pad(&self.display().to_string()).to_string()renders at the default precision (sof.precision()is ignored), andf.padthen interprets the precision as a maximum width and truncates the result — here"1.9 GiB"becomes"1.9 G". The no-width fast path forwards the formatter and honors precision, and the existingprecision()test pins precision to mean decimal places, so the width path is inconsistent with the rest of the crate.This renders the value with the requested precision first, then applies only the width, fill, and alignment. Added
test_display_width_with_precision; the existingtest_display_alignment(including custom fill) still passes.Checked:
cargo test,cargo test --no-default-features,cargo test --all-features,cargo fmt --check,cargo clippy --all-featuresall clean.