From eb8b67e69aadb1d40263f8a14f11c5eaf7bc4249 Mon Sep 17 00:00:00 2001
From: Peter Bower <37089506+pbower@users.noreply.github.com>
Date: Wed, 16 Sep 2026 21:19:22 +0100
Subject: [PATCH] Improve Matrix zero init

---
 Cargo.toml            | 2 +-
 src/structs/matrix.rs | 5 +++--
 2 files changed, 4 insertions(+), 3 deletions(-)

diff --git a/Cargo.toml b/Cargo.toml
index d53c786..e9873e2 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -47,7 +47,7 @@ ahash = { version = "0.8.12", optional = true }
 hashbrown = { version = "0.15", optional = true }
 parking_lot = { version = "0.12", optional = true }
 regex = { version = "1.12.3", optional = true }
-vec64 = { version = "0.5.1" }
+vec64 = { version = "0.5.2" }
 log = { version = "0.4.29", optional = true }
 
 [dev-dependencies]
diff --git a/src/structs/matrix.rs b/src/structs/matrix.rs
index 9b3e023..0a7bc7a 100644
--- a/src/structs/matrix.rs
+++ b/src/structs/matrix.rs
@@ -120,8 +120,9 @@ impl Matrix {
     pub fn new(n_rows: usize, n_cols: usize, name: Option<impl Into<String>>) -> Self {
         let stride = aligned_stride(n_rows);
         let len = stride * n_cols;
-        let mut vec = Vec64::with_capacity(len);
-        vec.resize(len, 0.0);
+        // SAFETY: Zero bits are a valid `f64`, and the allocator's zeroed path hands
+        // back untouched zero pages
+        let vec = unsafe { Vec64::zeroed(len) };
         let data = Arc::new(Buffer::from_vec64(vec));
         Matrix {
             n_rows,