title: What does the 'm' in a Python ABI tag mean?
body: <p>PEP 425 explains the compatibility tag format for built python distributions, but does not explain the ABI tag in full detail.</p>
  
  <p>The ABI tag can end with a combination of the letters 'd', 'm', and 'u'. As an example, it is explained within the PEP that the 'd' means an ABI with debugging, and <a href="https://stackoverflow.com/a/46839079/318877">this answer</a> explains that the 'u' denotes an interpreter compiled with <code>--enable-unicode=ucs4</code>, but I could not find the meaning of the 'm' anywhere.</p>