Bring decay into line with std::decay.

See https://svn.boost.org/trac/boost/ticket/7760.
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@@ -7,6 +7,11 @@
 
 [section:history History]
 
+[h4 Boost 1.60.0 ???]
+
+* Refactored traits to depend only on Boost.Config.  Greatly simplified code to improve readability and remove workarounds for old compilers no longer supported.
+* Fix __decay to follow C++11 semantics, see [@https://svn.boost.org/trac/boost/ticket/7760 #7760].
+
 [h4 Boost 1.58.0]
 
 * Fixed issue with CUDA on Clang compiler see [@https://svn.boost.org/trac/boost/ticket/10694 #10694].

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