The MSSQL Server team has done a great job lately with the MSSQL PDO Extension:
https://github.com/Microsoft/msphpsql
Moving to Github has made colaboration easier.
Also, they setup automatic extension compilation on AppVeyor (free for open source projects), like Tideways did:
https://ci.appveyor.com/project/tideways/php-profiler-extension/history
This "free's" the maintainers from having to build the binaries, as AppVeyor runs the tests and produces compiled binaries as artifacts.
Wincache could benefit doing the same...
Greetings and thanks!!!