I think you have misunderstood what this issue is about. The Java Language Specification already specifies that Java programs are written using the Unicode character set and that letters in identifiers can be drawn from the entire Unicode character set. The issue is that there are many ways to encode Unicode characters and that a single encoding is not used across the code base. The suggestion is merely to normalize this encoding so that all files use the same, so as to not confuse the tooling and complicate the build process.

Edit: Source: https://docs.oracle.com/javase/specs/jls/se8/html/jls-3.html...