bad kCFTaggedObjectID_Integer definition ?

https://github.com/kivy/pyobjus/blob/master/pyobjus/pyobjus_conversions.pxi#L188

defines it as (3 << 1) + 1

while all references i seem to find defines it as (1 << 1) + 1

http://www.crest.iu.edu/projects/conceptcpp/docs/html-ext/CGObjCMac_8cpp_source.html#l01623
http://bou.io/talks/TaggedPointersTests.html#4
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Open pyobjus/pyobjus_conversions.pxi at line 188 and compare the kCFTaggedObjectID_Integer definition with the two linked reference implementations. Check how the constant is used in nearby conversion code, then correct the definition if the references confirm the discrepancy and verify that the resulting value matches the intended tagged-pointer behavior.

Written by the indexing model from the issue text.