The call boundary with arguments — Promise.try's shape, made lazy: fn(...args) runs on first await, and whatever it throws (sync or async) becomes the rejection. The closure the caller would otherwise write by hand (Task(() => fn(a, b))) is built here instead.

const runGit = async (args: string[], cwd: string) => `ran git ${args[0]} in ${cwd}`;

const scan = Task.try(runGit, ['status', '--porcelain'], '.'); // lazy, args captured
await scan.retry(2); // three fresh runGit executions at most