objc_msgSend_fpret usage is probably wrong
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metajack commented
#74 changed a use of objc_msgSend to objc_msgSend_fpret, which the docs say is not needed on x86_64. There are comments in the pull request about an alternate fix. Some background on these functions can also be found here http://sealiesoftware.com/blog/archive/2008/11/16/objc_explain_objc_msgSend_fpret.html
Regardless of what the right fix is, the other methods that return CGFloat should also be updated.