test: expand threading and heapq test coverage#274

dbrattli merged 2 commits intomainfable-compiler/Fable.Python:mainfrom

repo-assist/test-improvements-2026-04-24-0a9e910a0b4a1106fable-compiler/Fable.Python:repo-assist/test-improvements-2026-04-24-0a9e910a0b4a1106Copy head branch name to clipboard