# Deno v1.23.4 — Release & Upgrade Intelligence
- **Product:** Deno (https://deno.com)
- **Version:** v1.23.4
- **Released:** Jul 12, 2022
- **Impact Score:** 5/10
- **Breaking Changes:** Not verified
- **Canonical Analysis:** https://changelogs.us/deno/updates/v1.23.4/

## Executive Summary (TL;DR)
Deno v1.23.4. Source highlight: feat(core): Re-export v8 use_custom_libcxx feature (#14475)

## New Features
- feat(core): Re-export v8 use_custom_libcxx feature (#14475)

## Improvements
- perf(cli/proc_state): Get error source lines from memory (#15031)
- perf(ext/ffi): leverage V8 Fast Calls (#15125)
- perf(ext/http): skip `core.isProxy` check for default ResponseInit (#15077)

## Bug Fixes
- fix(core): deflake WASM termination test (#15103)
- fix(coverage): better handling of multi-byte characters (#15159)
- fix(ext/console): Fix a typo in a warning when .timeEnd is called on an
- fix(ext/crypto): Adjust typings for `Crypto.getRandomValues()` (#15130)
- fix(ext/ffi): Avoid keeping JsRuntimeState RefCell borrowed for event loop
- fix(ext/ffi): allow opting out of fast ffi calls (#15131)