← Wednesday, September 30, 2026Languages & toolsRelease

Tcl/Tk 9.1 adds Unicode normalization and a microsecond-resolution timer

tcl-lang.org Editor score 7/10

Tcl/Tk 9.1 adds Unicode normalization, a monotonic microsecond-resolution timer, list and interpreter commands, and new C APIs. The release is useful to engineers maintaining Tcl applications or evaluating language-runtime changes.

What

Tcl/Tk 9.1 adds Tcl language features and interfaces alongside Tk updates, including accessibility and bidirectional-text support.

How

Tcl gains Unicode normalization, a microsecond-resolution monotonic timer, and list filtering; Tk adds a toggle-switch widget.

Why it matters

The updates offer engineers improved timing, text handling, and accessibility features in Tcl/Tk applications.

Read on tcl-lang.org → Hacker News · 108 comments

Headline, summary, brief and diagram are written by a model from the source's own text; the link, byline and numbers come from the source. Read the original before relying on a claim.