Probably an odd use case, but when having to a lot of disjointed AST nodes, APIs like printAstCompact force the creation of an AstPrinter instance on every print call, which in turns allocates a Map to register all printers. The constructor is private. This can quickly become an issue when printing a large amount of nodes. Let me know if you have a preference on how to handle this use case, I can submit a PR 🙇