The implementation of tsProject.src() has been replaced. Previously, files were resolved by a glob with gulp.src(). This glob was handled very inefficiently by glob-stream and the glob didn't always match the behavior of tsc. The new implementation uses the TypeScript api to resolve all files for better performance.
Related issues: #275, #326, #404, #406
The includes property of a tsconfig.json file is now also supported (#320).