Source Intelligence
Follow Discord

DisclaimerUnofficial, and not affiliated with Anthropic. Nearly all of this is read straight out of what ships: npm bundles, captured prompts, published docs. Anthropic's own notes go in verbatim, marked as theirs. The rest is my reading, and every entry carries the strings behind it. If one looks wrong, vote it down and say why.

← All of v2.1.239 Home All releases ←olderv2.1.238 v2.1.240newer→
Claude Code v2.1.239

Look-alike character table widened, and ASCII letters protected

You'll notice
Useful3 Signal2
Path Safety

Around eighty more look-alike characters are detected, and genuine ASCII letters are no longer rewritten.

What

About eighty more look-alike code points (Latin small capitals, Cherokee, Yi radicals, Armenian, Coptic, Cyrillic) now map to their ASCII letters. A bug where the table's uppercase-derivation step could rewrite genuine ASCII characters is fixed by refusing any mapping whose uppercase form is itself a plain ASCII letter.

Details
  • The guard is !/^[A-Za-z]$/.test(n) in the loop that extends the table.
Evidence

!/^[A-Za-z]$/.test(n)

Strings lifted out of the shipped bundle, so the claim above can be checked against them.

Related

Other releases about the same thing. Found by shared names or similar wording; neither means one caused the other.

See this entry in the whole of v2.1.239 →