Hi Andrew,
Does anyone know whether blaze-builder is deprecated in favour of bytestring's new Builder module, or are they the same, or...
Recently I supported both blaze-builder and bytestring's Builder in "fast-logger". So, I would like to share my experience. bytestring is tightly bound to GHC's version. GHC version 7.6.x is shipped with bytestring 0.10.0.2 while GHC version 7.8.x will be shipped with bytestring 0.10.4.0. To my impression, bytestring's APIs are stable and good enough in bytestring 0.10.4.0. For instance, while bytestring 0.10.4.0 provides Data.ByteString.Builder and .Extra, bytestring 0.10.0.2 does not. (Please don't confuse them with Data.ByteString.Lazy.Builder.) So, I think switching blaze-builder to bytestring's Builder is too early at this moment. But if you are interested, you can get ready for bytestring's Builder. You can use the following C's macro: #if MIN_VERSION_bytestring(0,10,4) For more information, please see the source of fast-logger. --Kazu