<p>Yeah, significant figures was all I could think of too. Seems fragile; let's leave it for now. If we find a compelling use case for making zoom optional and a good way of determining a default, it will still be possible to check if there are two slash-separated components versus three.</p>
<p>The hash now looks like <code>#map=z/lat/lon&layers=x</code>. Note (N) and data (D) layers are included, and there's a special case that <code>layers=M</code> is dropped -- in other words, if you have the default Mapnik base layer and no overlays, there's no <code>layers</code> parameter clutter.</p>
<p><a href="https://github.com/tomhughes" class="user-mention">@tomhughes</a> Can we get a test deploy of this please?</p>
<p style="font-size:small;-webkit-text-size-adjust:none;color:#666;">—<br>Reply to this email directly or <a href='https://github.com/openstreetmap/openstreetmap-website/pull/378#issuecomment-21745594'>view it on GitHub</a>.<img src='https://github.com/notifications/beacon/uTRSc6ihLa7Shf84BpiOpiUrGUapkX5IpvHQvKW5tj4sebzHIR9_xuyLZJp4vOv2.gif' height='1' width='1'></p>