• BUGFIX: Add missing extra_args to Rust constructor generation (bug 1765855)
• Breaking change: glean_parser now generates metrics compatible with the UniFFI-powered Glean SDK.
  This is not backwards-compatible with previous versions.
• Generate Rate, Denominator and Numerator metrics for Kotlin and Swift
• Explicitly skip Rate, Denominator and Numerator metrics for JavaScript.
  These will cause a build failure by default, but can be turned into warnings on request.
  Use -s fail_rates=false to enable warning-only mode.