Sync to ulfjack/ryu@00ecce8

README.md

@@ -19,7 +19,7 @@ C, [https://github.com/ulfjack/ryu][upstream].
 uses nothing from the Rust standard library so is usable from no_std crates.*
 
 [paper]: https://dl.acm.org/citation.cfm?id=3192369
-[upstream]: https://github.com/ulfjack/ryu/tree/608ce6fdfe7743a6dbaadeebd81ae1146603fc6d
+[upstream]: https://github.com/ulfjack/ryu/tree/00ecce8c59ab9bdb7b8f6c3dc54ee467cfab6b43
 
 ```toml
 [dependencies]

src/d2s.rs

@@ -145,6 +145,8 @@ pub fn decimal_length17(v: u64) -> u32 {
 // A floating decimal representing m * 10^e.
 pub struct FloatingDecimal64 {
     pub mantissa: u64,
+    // Decimal exponent's range is -324 to 308
+    // inclusive, and can fit in i16 if needed.
     pub exponent: i32,
 }
 

src/f2s.rs

@@ -176,6 +176,8 @@ fn mul_pow5_div_pow2(m: u32, i: u32, j: i32) -> u32 {
 // A floating decimal representing m * 10^e.
 pub struct FloatingDecimal32 {
     pub mantissa: u32,
+    // Decimal exponent's range is -45 to 38
+    // inclusive, and can fit in i16 if needed.
     pub exponent: i32,
 }