60b0a0e006
_guess_ext_from_data: data[:5] == b"#!SILK" -> data[:6] (6-byte string) _looks_like_silk: data[:4] == b"#!SILK" -> data[:6] The previous slices were too short to ever match the 6-byte "#!SILK" literal, relying entirely on the "#!SILK_V3" (9-byte) and 0x02! (2-byte) fallback paths for SILK format detection.