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Re:Rust: Not So Great For Codec Implementing by spatulon on Tuesday August 01, 2017 @12:42PM (#14902637)
It's still widely used and not considered archaic in British and Australian English.
Re:Rust: Not So Great For Codec Implementing by bigdubs on Tuesday August 01, 2017 @12:47PM (#14902707)
https://www.merriam-webster.com/dictionary/whilst

The definition is singularly, "while", with no extra connotation, other than it is as you said chiefly British.

https://trends.google.com/trends/explore?q=while,whilst

"While" is, not surprisingly, much more widely used, "whilst" being more affected.