<p>I'm very curious to learn which Go packages you feel have well-designed APIs that:</p>
<ul>
<li>Are pleasing or intuitive to use</li>
<li>Accurately model the domain within Go's type system</li>
</ul>
<p>And among these, if you were to design the API from scratch, what would you change?</p>
<p>If possible, and to the extent that it's possible, I'd like to leave out documentation quality as a factor.</p>
