Trailing Commas

[Johannes Spangenberg]

Hello, I was curious about the potential consideration for extending 
support for trailing commas. While I don't consider them critical, I 
find myself regularly bothered that I cannot use them. I see several 
areas in the language where they could be beneficial:

  * Argument list in method calls
  * Parameter list in method declaration
  * Throws clause in method declaration
  * Implements clause in classes
  * Extends clause in interfaces
  * Type arguments
  * Type parameters

It's worth noting that array initializers and enum definitions already 
support trailing commas. There have been instances where I considered 
replacing a List or Set with an array simply because arrays support 
trailing commas, whereas List.of does not.

A quick google search brought up JDK-6407472 
<https://bugs.openjdk.org/browse/JDK-6407472>, but it's rather dated, 
and I wouldn't entirely agree with the comment. Based on my subjective 
experience, many, if not most, modern languages embrace trailing commas. 
For instance, the official style guide of Rust and various style guides 
for JavaScript recommend their use. While Python's official style guide 
suggests the use of trailing commas, it doesn't make a clear recommendation.

Best Regards,
Johannes
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