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This is the main reason why the I<priority> has been detached from order
of appearance.

=head3 Sources as hash reference

Up to version C<2.007001>, the C<sources> key can only be set to an
array reference holding a list of sources. Each command level can have
its own list, or rely on the default one provided by C<App::Easer>.

This setup works in many situation but becomes too rigid when dealing
with inherited options. As an example, suppose that we define an option
C<loglevel> allowing to set the log level (e.g. info, debug, trace, ...)
for our suite of commands. At this point, either we limit the option at
the highest level only (then setting the logger configuration in the
topmost command's C<commit>), or we have to wait until the leaf command
is determined, which implies that every leaf command must repeat the
code to set the logger's configuration.

Additionally, this setup might not play well with options that load
configurations from files, because some files might be loaded based on