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Sweep 22 Oct 2026 · 21:04Z Build v2.1.309 528 read Stable v2.1.308 Latest v2.1.309 Next v2.1.309 Feeds RSS JSON llms.txt llms-full.txt Unofficial

Claude Code v2.1.251 ·

PNG signature constant kept as a shared buffer

The PNG file signature is kept once and reused for recognising pasted images.

Under the hood Internal Changes
JSON All of v2.1.251
Under the hoodTier: how much it should matter to you
1Useful: my rating, 1 to 5
0Signal: worth watching, 1 to 5
ElsewhereArea: what it touches
Internal ChangesKind: in v2.1.251,
Internal ChangesSection of the release
What

The eight bytes that mark the start of a PNG file are held in one shared constant, used for recognising PNG data such as pasted images.

Evidence

Buffer.from([137, 80, 78, 71, 13, 10, 26, 10])

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

See this entry in the whole of v2.1.251 →

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