Type-Checking Interface in Ruby
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One of my favorite parts in Sandi Metz’s excellent Practical Object Oriented Design in Ruby is when she describes how to enforce lightweight interfaces so that multiple objects can play a role reliably. And I thought: how I can I enforce this in a much-more heavy-handed and annoying way?

This question also ties into two ridiculous
tweets of mine:

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Software Craftsmanship Tour: Aidan Rogers
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A few weeks ago I met up with Aidan Rogers to hack on some code. Aidan and I were coworkers at Cambrian House a few years ago.

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