fix: increase precision of LN_ constants

Author: robjtede

Cargo.toml

@@ -2,7 +2,11 @@
 name = "bytesize"
 description = "A utility for human-readable byte count representations"
 version = "1.3.0"
-authors = ["Hyunsik Choi <[email protected]>", "MrCroxx <[email protected]>"]
+authors = [
+    "Hyunsik Choi <[email protected]>",
+    "MrCroxx <[email protected]>",
+    "Rob Ede <[email protected]>",
+]
 keywords = ["byte", "byte-size", "utility", "human-readable", "format"]
 categories = ["development-tools", "filesystem"]
 repository = "https://github.com/bytesize-rs/bytesize"

src/lib.rs

@@ -65,15 +65,14 @@ const UNITS_IEC: &str = "KMGTPE";
 
 /// SI (decimal) units.
 ///
-///
 /// See <https://en.wikipedia.org/wiki/Kilobyte>.
 const UNITS_SI: &str = "kMGTPE";
 
 /// `ln(1024) ~= 6.931`
-const LN_KIB: f64 = 6.931471806;
+const LN_KIB: f64 = 6.931_471_805_599_453;
 
 /// `ln(1000) ~= 6.908`
-const LN_KB: f64 = 6.907755279;
+const LN_KB: f64 = 6.907_755_278_982_137;
 
 #[derive(Debug, Clone, Default)]
 pub enum Format {
@@ -471,7 +470,7 @@ mod tests {
         assert_to_string("293.9 KiB", ByteSize::kb(301), Format::IEC);
         assert_to_string("301.0 kB", ByteSize::kb(301), Format::SI);
 
-        assert_to_string("1024.0 KiB", ByteSize::mib(1), Format::IEC);
+        assert_to_string("1.0 MiB", ByteSize::mib(1), Format::IEC);
         assert_to_string("1.0 MB", ByteSize::mib(1), Format::SI);
 
         assert_to_string("1.9 GiB", ByteSize::mib(1907), Format::IEC);

src/serde.rs

@@ -94,7 +94,7 @@ mod tests {
     #[test]
     fn test_serde_json() {
         let json = serde_json::to_string(&ByteSize::mib(1)).unwrap();
-        assert_eq!(json, "\"1024.0 KiB\"");
+        assert_eq!(json, "\"1.0 MiB\"");
 
         let deserialized = serde_json::from_str::<ByteSize>(&json).unwrap();
         assert_eq!(deserialized.0, 1048576);