Type Constraint Unions

Sometimes just one type is not enough ...

subtype 'IO::Handle'
    => as 'Object'
    => where { $_->isa('IO::Handle') };

has 'template' => (
    is  => 'ro',
    isa => 'Str | ScalarRef | FileHandle | IO::Handle',
);

• Taken from Excel::Template::Plus
• store anything which Template would accept in it's constructor.
• Caveat: In type constraint unions all types must be pre-existing types