Some of the core classes don't run through bless during object
creation (apparently for efficiency reasons). This means that if you define
a class that inherits from Array, for example, you can't define properties
for the class using the normal has route.
The Has role addresses this by importing a new new that takes advantage
of bless.
The following code breaks. If you try to access $.foo below, you get an
undefined Any value instead of 'bar'.
class MySet is Array {
has $.foo = 'bar';
}
say MySet.new.foo; # Any()
Fix this with does Has from Class::Utils:
use Class::Utils;
class MySet is Array does Has {
has $.foo = 'bar';
}
say MySet.new.foo; # bar
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