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+String eval is often used for dynamic code generation. For instance, Moose uses
+it heavily, to generate inlined versions of accessors and constructors, which
+speeds code up at runtime by a significant amount. String eval is not without
+its issues however - it's difficult to control the scope it's used in (which 
+determines which variables are in scope inside the eval), and it can be quite
+slow, especially if doing a large number of evals.
+
+This module attempts to solve both of those problems. It provides an
+eval_closure function, which evals a string in a clean environment, other than
+a fixed list of specified variables. It also caches the result of the eval, so
+that doing repeated evals of the same source, even with a different
+environment, will be much faster (but note that the description is part of the
+string to be evaled, so it must also be the same (or non-existent) if caching
+is to work properly).
+
+WWW:	http://search.cpan.org/dist/Eval-Closure