chore: bump MSRV to 1.87 for copy slice in constfn

Author: mriise

Cargo.toml

@@ -13,7 +13,7 @@ license = "MIT"
 readme = "README.md"
 documentation = "https://docs.rs/multihash/"
 edition = "2021"
-rust-version = "1.64"
+rust-version = "1.87"
 
 [package.metadata.docs.rs]
 all-features = true

README.md

@@ -35,7 +35,7 @@ Then run `cargo build`.
 
 ## MSRV
 
-The minimum supported Rust version for this library is `1.64.0`.
+The minimum supported Rust version for this library is `1.87.0`.
 This is only guaranteed without additional features activated.
 
 ## Usage

src/multihash.rs

@@ -62,11 +62,9 @@ impl<const S: usize> Multihash<S> {
         }
         let size = input_digest.len();
         let mut digest = [0; S];
-        let mut i = 0;
-        while i < size {
-            digest[i] = input_digest[i];
-            i += 1;
-        }
+        // NOTE: cant use range systax in const fn yet
+        digest.split_at_mut(size).0.copy_from_slice(input_digest);
+
         Ok(Self {
             code,
             size: size as u8,