title: When and why did the Swedish locale(s) change from formatting money sums between these formats?
body: <p>I was one of the few people who bothered to learn how to format numbers and money sums. It used to be, and I thought it was still, like this:</p>
  
  <pre><code>123 456 789,00
  123.456.789,00
  </code></pre>
  
  <p>The first one is a non-money-related number. The second is a money sum.</p>
  
  <p>However, the PHP NumberFormat class (using ICU data, I believe), as well as Windows 10 (at least in the 1903 version) now use this:</p>
  
  <pre><code>123 456 789,00
  123 456 789,00
  </code></pre>
  
  <p>That is, both non-monetary numbers and money sums are formatted in the same way, with spaces for thousands separators and commas for decimal marks.</p>
  
  <p>When I looked in the Windows settings just a couple of years ago, it still used periods for thousands separators for money sums for Sweden.</p>
  
  <p>This <strong><em>must</em></strong> have recently changed and been incorporated into both the ICU data and whatever Microsoft uses for Windows. (I assume that they just use the freely available ICU data as well.)</p>
  
  <p><strong><em>The problem</em></strong>: I'm trying to determine when exactly this was changed, and maybe even <strong><em>why</em></strong>. Although I guess it's nice in theory that things are simplified and standardized, there is definitely something valuable and interesting about regional differences, and there certainly are a ton of them in many languages/locales/combinations.</p>