<p><b>@gravitystorm</b> commented on this pull request.</p>

<hr>

<p>In <a href="https://github.com/openstreetmap/openstreetmap-website/pull/1566#discussion_r123768311">lib/geo_record.rb</a>:</p>
<pre style='color:#555'>>  module GeoRecord
+  # Ensure that when coordinates are printed that they are always in decimal degrees,
+  # and not e.g. 4.0e-05
+  # Unfortunately you can't extend Numeric classes directly (e.g. `Coord < Float`).
+  class Coord < DelegateClass(Float)
</pre>
<p>Do you mean something like <code>Coord < Float</code>? Ruby (or MRI, specifically) doesn't let you do that unfortunately, see e.g. <a href="http://www.virtuouscode.com/2011/08/17/you-cant-subclass-integers-in-ruby/">http://www.virtuouscode.com/2011/08/17/you-cant-subclass-integers-in-ruby/</a> or <a href="http://flylib.com/books/en/2.44.1.41/1/">http://flylib.com/books/en/2.44.1.41/1/</a>  . In short, some built-in classes are special-cased and don't behave like normal ruby classes. The delegate library is there to provide an alternative approach.</p>

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