+CONSTANTS
+ "A_THREADSAFE"
+ True iff the module could have been built with thread-safety features
+ enabled. This constant only has a meaning with your perl is threaded ;
+ otherwise, it'll always be false.
+
+ "A_FORKSAFE"
+ True iff this module could have been built with fork-safety features
+ enabled. This will always be true except on Windows where it's false for
+ perl 5.10.0 and below .
+
+CAVEATS
+ The pragma doesn't apply when one dereferences the returned value of an
+ array or hash slice, as in "@array[$id]->{member}" or
+ @hash{$key}->{member}. This syntax is valid Perl, yet it's discouraged
+ as the slice is here useless since the dereferencing enforces scalar
+ context. If warnings are turned on, Perl will complain about one-element
+ slices.
+