# Difftastic 0.64.0

- Product: Difftastic (https://whatsnew.fyi/product/difftastic)
- Vendor: Wilfred Hughes
- Date: 2025-06-15
- Version: 0.64.0
- Original notes: https://github.com/Wilfred/difftastic/releases/tag/0.64.0
- Permalink: https://whatsnew.fyi/product/difftastic/releases/0.64.0

What's New is an index, not a publisher: every entry below links to the vendor's own release notes, which are the authoritative source. Entries are labelled where they are hand-curated sample data, pre-releases, or drawn from a secondary source such as a developer blog.

Reuse: the summaries, labels and curation here are © What's New. Quote freely with attribution and a link back; wholesale republication of the corpus is not permitted — terms: https://whatsnew.fyi/terms. The vendors' own release notes remain their publishers'.

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- **changed** — Updated to the latest tree-sitter parser for Erlang, F#, Gleam, Pascal and Swift
- **changed** — File detection is now stricter for UTF-8 and recognises more compression file types as binary
- **added** — Added support for Verilog and SystemVerilog
- **changed** — Switched from MiMalloc to Jemalloc for allocation

Difftastic is a structural diff tool that understands syntax. See [the manual](https://difftastic.wilfred.me.uk/) to get started, and [the changelog](https://github.com/Wilfred/difftastic/blob/master/CHANGELOG.md) for historical changes.

###### Parsing

Updated to the latest tree-sitter parser for Erlang, F#, Gleam, Pascal and Swift.

File detection is now stricter for UTF-8, and recognises more compression file types as binary (e.g. zstd or bzip2).

Added support for Verilog and SystemVerilog.

###### Build

CI on GitHub now uses Ubuntu 22.04 for Linux builds (previously Ubuntu 20.04), so prebuilt binaries will require a newer glibc version to run.

###### Internal

Difftastic has switched from MiMalloc to Jemalloc for allocation. This is modest performance regression (up to 20% longer runtime in testing). Jemalloc is currently easier to build (see issue #805) and has fewer pathological performance corner cases.