For reference: This is a solved bug.

There was an error in core:strconv parse_f64_prefix(), see

• issue: https://github.com/odin-lang/Odin/issues/4361
• fix: https://github.com/odin-lang/Odin/pull/4410/commits/a9f2271a905d74db6aae76298540e39aec355304

(I'm just writing this because it bugs me if solved questions look unanswered, sorry if that annoys anyone else)