Should sbt.internal.inc.AnalyzingCompiler be Closeable?

[Friendseeker]

Currently sbt.internal.inc.AnalyzingCompiler holds a bunch of scala compiler related jars in its ClassLoaderCache.

While build tools can just call AnalyzingCompiler.classLoaderCache.map(_.close()) to release the jars, I am thinking if it would be better for AnalyzingCompiler to be Closeable, so build tools using Zinc can just call AnalyzingCompiler.close() and every resource that the Zinc compiler instance is holding is then closed.

Also making AnalyzingCompiler Closable makes it more obvious that Zinc holds certain resources, and once the build tool no longer need to use the compiler, the resources needs to be released.