Late last week we released the September 2018 Preview of Quality Rollup.
This release contains the following quality and reliability improvements.
- Updated code to prevent errors regarding invalid date format when Japanese Era 4 is used with a future date 
- Parsing Japanese dates having a year number exceeding the number of years in that date era will succeed instead of throwing errors 
- When asynchronously reading a process output an IndexOutOfRangeException is thrown when less than a character’s worth of bytes is read at the beginning of a line 
- Fix in the JIT compiler for a rare case of struct field assignments,