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  1. or download this
    has file => ( isa => 'ExistingFile', is => 'ro', required => 1, coerce
+ => 1 );
  2. or download this
    You cannot coerce an attribute (file) unless its type (ExistingFile) h
+as a coercion at /tmp/test.pl line 26
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    subtype 'ExistingFile' =>
    as 'AFile' =>
...
    via { file($_) };

has file => ( isa => 'ExistingFile', is => 'ro', required => 1, coerce
+ => 1 );
  4. or download this
    for my $ftype (qw/ AFile ExistingFile /) {
    coerce  $ftype =>
        from 'Str' =>
        via { file($_) };
}