anchors don't survive when files are included using the Include Schema

[djerius]

I'd like to use included yaml files to keep common configuration data. For example:

# db.yml
db : &db
  host : hostname
  port : 5432

And in the yaml files used by the applications,

# app1.yml
config : !include db.yml
args :
   db : *db

But (perhaps unsurprisingly) the anchor is not carried over from the included file:

my $include = YAML::PP::Schema::Include->new;
my $yp      = YAML::PP->new( schema => [ q{+}, 'Merge', $include ] );
$include->yp($yp);
p $yp->load_file('app1.yml');

Results in

No anchor defined for alias 'db' at .../YAML/PP/Parser.pm line 61.
 at .../YAML/PP/Loader.pm line 94.

I find that I use anchors quite a bit to avoid duplication, and the ability for them to exist across included file boundaries would be quite helpful.