AFNetworking/AFNetworking — pull request #989 by danyowdee (2013-05-12 15:39:55+00:00)
Title: Fix for leaked strings in -[AFHTTPClient requestWithPath:method:params:]

`CFStringConvertEncodingToIANACharSetName` is documented to follow CF’s create-rule, so the cast needed to be transferring ownership to ARC.