Under the hood
Useful1 Signal0
The PNG file signature is kept once and reused for recognising pasted images.
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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.