When you import a function into a Perl package, it will naturally also
be available as a method.
The namespace::autoclean pragma will remove all imported symbols at the
end of the current package's compile cycle. Functions called in the
package itself will still be bound by their name, but they won't show
up as methods on your class or instances.
This module is very similar to namespace::clean, except it will clean
all imported functions, no matter if you imported them before or after
you used the pragma. It will also not touch anything that looks like a
method.
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