see import and unimport and no and namespace::autoclean

moose might unimport its stuff ... but strict is lexical like that (unimport)

$ perl -e " use strict; BEGIN{eval q{use strict; $foo = 1;};warn$@;} n
+o strict; $bar = 2; "
Global symbol "$foo" requires explicit package name at (eval 5) line 1
+.
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