Here is the second release candidate for Nim 1.6.10, available from our nightly builds:
If you're using Choosenim, you should be able to get this RC by doing:
choosenim "#version-1-6"
choosenim update "#version-1-6"
This brings 7 new commits since RC1.
The complete list of commits between 1.6.8 and this RC is available here.
If there are any regressions, please let us know. Otherwise, this will become the official Nim 1.6.10 release in the following days.