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The reason for this is the new codec buffering code in 2.4:
The codec might read and decode more data from the byte
stream than is neccessary for decoding one line. I.e. when
reading line n, the codec might decode bytes that belong to
line n+1, n+2 etc. too. If there's a decoding error in this
data, line n gets reported. I don't think there's a simple
fix for this.