aeson / release-notes.markdown

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+# 0.4 to 0.5
+When used with the UTF-8 encoding performance improvements introduced
+in version of the text package, this release improves
+aeson's JSON encoding performance by 33% relative to aeson 0.4.
+As part of achieving this improvement, an API change was necessary.
+The `fromValue` function in the `Data.Aeson.Encode` module now uses
+the text package's `Builder` type instead of the blaze-builder
+package's `Builder` type.
 # 0.3 to 0.4
 ## Ease of use