To make a minimal perl distribution, it's useful to look at
F<t/lib/commonsense.t>.
+=head2 Bundle dual life modules in ext/
+
+For maintenance (and branch merging) reasons, it would be useful to move
+some architecture-independent dual-life modules from lib/ to ext/, if this
+has no negative impact on the build of perl itself.
+
+However, we need to make sure that they are still installed in
+architecture-independent directories by C<make install>.
+
=head2 Improving C<threads::shared>
Investigate whether C<threads::shared> could share aggregates properly with
the perl API that comes from writing modules that use XS to interface to
C.
+=head2 investigate removing int_macro_int from POSIX.xs
+
+As a hang over from the original C<constant> implementation, F<POSIX.xs>
+contains a function C<int_macro_int> which in conjunction with C<AUTOLOAD> is
+used to wrap the C functions C<WEXITSTATUS>, C<WIFEXITED>, C<WIFSIGNALED>,
+C<WIFSTOPPED>, C<WSTOPSIG> and C<WTERMSIG>. It's probably worth replacing
+this complexity with 5 simple direct wrappings of those 5 functions.
+
+However, it would be interesting if someone could measure the memory usage
+before and after, both for the case of C<use POSIX();> and the case of
+actually calling the Perl space functions.
+
=head2 safely supporting POSIX SA_SIGINFO
Some years ago Jarkko supplied patches to provide support for the POSIX