Function merge_deps

misc/diff-cache.py:34–36

(all: dict[str, set[str]], new: dict[str, set[str]])

def merge_deps(all: dict[str, set[str]], new: dict[str, set[str]]) -> None:
    for k, v in new.items():
        all.setdefault(k, set()).update(v)


def sort_deps(