From 79c90ff7040ea77f016c2256601f00ab5e935e28 Mon Sep 17 00:00:00 2001
From: Eshwar Singh Rajaputana <145380153+Eshwar1440@users.noreply.github.com>
Date: Mon, 6 Apr 2026 03:58:18 -0500
Subject: [PATCH] numfmt: preserve fractional digits when --from-unit is used
 without suffix and fixed String format (#11674)

* numfmt: preserve fractional digits when --from-unit is used without suffix and fixed String format

* numfmt: simplify redundant if branches caught by clippy

* numfmt: fix precision condition to only preserve decimals when input has no unit suffix
---
 src/uu/numfmt/src/format.rs  | 10 ++++++++--
 tests/by-util/test_numfmt.rs |  1 -
 2 files changed, 8 insertions(+), 3 deletions(-)

diff --git a/src/uu/numfmt/src/format.rs b/src/uu/numfmt/src/format.rs
index 46f7336e5..e1b5101f2 100644
--- a/src/uu/numfmt/src/format.rs
+++ b/src/uu/numfmt/src/format.rs
@@ -374,11 +374,12 @@ fn transform_from(s: &str, opts: &TransformOptions, options: &NumfmtOptions) ->
     .map_err(|original| {
         detailed_error_message(s, opts.from, &options.unit_separator).unwrap_or(original)
     })?;
+    let had_no_suffix = suffix.is_none();
     let i = i * (opts.from_unit as f64);
 
     remove_suffix(i, suffix, opts.from).map(|n| {
         // GNU numfmt doesn't round values if no --from argument is provided by the user
-        if opts.from == Unit::None {
+        if opts.from == Unit::None || had_no_suffix {
             if n == -0.0 { 0.0 } else { n }
         } else if n < 0.0 {
             -n.abs().ceil()
@@ -541,7 +542,12 @@ fn format_string(
 
     let precision = if let Some(p) = options.format.precision {
         p
-    } else if options.transform.from == Unit::None && options.transform.to == Unit::None {
+    } else if options.transform.to == Unit::None
+        && !source_without_suffix
+            .chars()
+            .last()
+            .is_some_and(char::is_alphabetic)
+    {
         parse_implicit_precision(source_without_suffix)
     } else {
         0
diff --git a/tests/by-util/test_numfmt.rs b/tests/by-util/test_numfmt.rs
index 18a8eab66..ae03c9ffd 100644
--- a/tests/by-util/test_numfmt.rs
+++ b/tests/by-util/test_numfmt.rs
@@ -1417,7 +1417,6 @@ fn test_to_auto_rejected_at_parse_time_issue_11662() {
 // `--from-unit` multiplication with fractional input rounds to an integer;
 // GNU preserves the fractional digits.
 #[test]
-#[ignore = "GNU compat: see uutils/coreutils#11663"]
 fn test_from_unit_fractional_precision_issue_11663() {
     new_ucmd!()
         .args(&["--from=iec", "--from-unit=959", "--", "-615484.454"])