| Index: sdk/lib/io/data_transformer.dart
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| diff --git a/sdk/lib/io/data_transformer.dart b/sdk/lib/io/data_transformer.dart
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| index 6a50af49f80c3c676dcde2ca3ce9e56c7e62ea3d..d908e6744299cf2301e725854f88f924dd3b6ddd 100644
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| --- a/sdk/lib/io/data_transformer.dart
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| +++ b/sdk/lib/io/data_transformer.dart
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| @@ -275,7 +275,9 @@ class GZipCodec extends Codec<List<int>, List<int>> {
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|   * The [ZLibEncoder] encoder is used by [ZLibCodec] and [GZipCodec] to compress
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|   * data.
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|   */
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| -class ZLibEncoder extends Converter<List<int>, List<int>> {
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| +class ZLibEncoder extends Converter<List<int>, List<int>>
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| +    implements ChunkedConverter<List<int>, List<int>, List<int>, List<int>> {
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| +
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|    /**
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|     * When true, `GZip` frames will be added to the compressed data.
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|     */
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| 
 |