Small thing I think make sense

[jduarte]

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Hi John,

First of all, congrats on this gem. I really think it's well thought and designed!

I was seeing your example and I think that the method destroyable_by? should default to updatable_by? instead of true like you show in your README example.

What do you think?

Greetings,

[jnunemaker]

Why?

[jduarte]

By default if only some users are able to update a record, only the same users are able to destroy it. When I think in real-life apps I've made nobody without access to update an object has permissions to destroy that same object.

Greets