feat(png)!: preserve metadata across a re-encode, and name what could not come along - #550

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justin13888 wants to merge 14 commits into

feat/440-png-cabxfrom

fix/483-png-metadata-preservation

Commits on Sep 10, 2026

feat(png): preserve metadata across a re-encode, and refuse the chunk pairs the spec forbids
justin13888
committed
0a7e665
test(png): pin Latin-1 text, the refused chunk pairs, and what a re-encode carries
justin13888
committed
d8c2ffd
fix(png)!: implement §11.3.3's text clauses and stop refusing the colour pair
justin13888
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d7868bc
feat(cli): say what metadata a conversion could not carry
justin13888
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47b42c3
docs(png): record the clauses metadata preservation implements
justin13888
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0a78c0f
test(png): pin what end_carry separates and what a dropped payload is called
justin13888
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0314208
fix(png)!: carry an XMP packet's framing, and report what §11.3.3 only advises
justin13888
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cc52efd
docs(png): correct what preservation carries and what it only reports
justin13888
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5d71425
test(png): pin both readings of an XMP chunk's iTXt framing
justin13888
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beda774
docs(png): say whose job the colour-chunk ranking is
justin13888
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64a61f4
docs(png): cite the sections the vendored spec actually numbers
justin13888
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9243d2e
fix(png): drop a text string's null instead of refusing the encode
justin13888
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ad178e0
docs(png): name the conformance clause, and stop contradicting the colour record
justin13888
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b4fa5ad
docs(png): let the notice list stay the enum's, and name both payloads a null drops
justin13888
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af5cbdb