+ The implementation was tweaked to work around several limitations of
+ vanilla "perl" pragmas : it's thread safe, and doesn't suffer from a
+ "perl 5.8.x-5.10.0" bug that causes all pragmas to propagate into
+ "require"d scopes.
+
+ With 5.8 perls, the pragma does not propagate into "eval STRING". This
+ is due to a shortcoming in the way perl handles the hints hash, which is
+ addressed in perl 5.10.
+