Ensure our lengths use isize and not usize for checks.

Author: Alexhuszagh

Cargo.toml

@@ -1,6 +1,6 @@
 [package]
 name = "fast-float2"
-version = "0.2.2"
+version = "0.2.3"
 authors = ["Ivan Smirnov <[email protected]>", "Alex Huszagh <[email protected]>"]
 repository = "https://github.com/Alexhuszagh/fast-float-rust"
 documentation = "https://docs.rs/fast-float2"

README.md

@@ -12,7 +12,7 @@ This crate provides a super-fast decimal number parser from strings into floats.
 
 ```toml
 [dependencies]
-fast-float2 = "0.2.2"
+fast-float2 = "0.2.3"
 ```
 
 There are no dependencies and the crate can be used in a no_std context by disabling the "std" feature.

src/common.rs

@@ -18,8 +18,8 @@ impl<'a> AsciiStr<'a> {
         }
     }
 
-    pub fn len(&self) -> usize {
-        self.end as usize - self.ptr as usize
+    pub fn len(&self) -> isize {
+        self.end as isize - self.ptr as isize
     }
 
     /// # Safety
@@ -28,7 +28,7 @@ impl<'a> AsciiStr<'a> {
     #[inline]
     pub unsafe fn step_by(&mut self, n: usize) -> &mut Self {
         debug_assert!(
-            n <= self.len(),
+            n < isize::MAX as usize && n as isize <= self.len(),
             "buffer overflow: stepping by greater than our buffer length."
         );
         // SAFETY: Safe if `n <= self.len()`