<p></p>
<p dir="auto">The OSM website treats underscores and spaces in links the same way, but in OSM tags it matters.</p>
<p dir="auto"><a href="https://osm.org/way/514021415/history" rel="nofollow">https://osm.org/way/514021415/history</a></p>
<p dir="auto">Click on the "place of worship" in the version 3 and "place_of_worship" in the version 4. You will see that the link directs you to the same Wiki page, even though tags<br>
<code class="notranslate">amenity=place of worship</code> and <code class="notranslate">amenity=place_of_worship</code> are technically different.<br>
Visually we can see spaces and underscores, but due to the fact that there is a blue link to the Wiki page, it's hard to see that the tag is invalid.</p>

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