Should follow whatwg/encoding@19b0ebf0e48c3a607ab7623b5b272642dd59d6e7. Unfortunately, this is not an easy task which should update both the encoder, decoder and tests. Also it would be desirable to have a version of ISO-2022-JP encoding with JIS X 0212 and/or 0213 support as an extra bonus.
Should follow whatwg/encoding@19b0ebf0e48c3a607ab7623b5b272642dd59d6e7. Unfortunately, this is not an easy task which should update both the encoder, decoder and tests. Also it would be desirable to have a version of ISO-2022-JP encoding with JIS X 0212 and/or 0213 support as an extra bonus.