Serhiy Storchaka <storchaka+cpyt...@gmail.com> added the comment:

Different projects solve the problem with async in different ways. Many of them 
rename "async" parameter to "async_". Some renames it to "_async" or replace 
with an opposite parameter "sync". Some projects keep supporting of "async" in 
older Python versions by using var-keyword parameters, but not all are aware of 
this possibility. If the preferable way be described in the What's New, it 
would help porting to 3.7.

Another important language change missed in the What's New is keeping insertion 
order in dicts.

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<https://bugs.python.org/issue32996>
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