fix(form-data): preserve leading BOM in multipart text parts#317
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andreiltd merged 1 commit intoJul 20, 2026
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Per the Fetch spec, a multipart/form-data part without a filename is decoded with "UTF-8 decode without BOM", which preserves a leading U+FEFF. The parser used encoding_new_decoder_with_bom_removal, which strips it, so "\uFEFFhello" was returned as "hello". Use encoding_new_decoder_without_bom_handling, matching the spec text already quoted in the surrounding comment. Add an integration test. Signed-off-by: Daijiro Wachi <daijiro.wachi@gmail.com>
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Per the Fetch spec, a multipart/form-data part without a filename is decoded with "UTF-8 decode without BOM", which preserves a leading U+FEFF. The parser used encoding_new_decoder_with_bom_removal, which strips it, so "\uFEFFhello" was returned as "hello".
Use encoding_new_decoder_without_bom_handling, matching the spec text already quoted in the surrounding comment. Add an integration test.