Roles can also be mixed in using 'is'.

[gdonald]

The problem

The docs say a Role can be mixed into a class using "does" but fails to mention that "is" also works.

Solution provided

Update the docs to clarify how "is" also works to mix a Role into a class.

[jnthn]

The semantics of is with a role are quite different from those offered by does. With is, a class is punned from the role, and then inherited from. Thus, there is no flattening composition, and none of the safeties it provides.

[gdonald]

Thank you for the comment. Relying heavily on your explanation I updated my PR to explain the difference a bit more.

[lizmat]

s/none of the safeties C provides./none of the safeties which C provides./

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