Command whose exit code indicates clean or dirty working directory

What is the simplest git command that returns 0 if the working directory is completely clean, or nonzero if it is dirty in any way (staged diff, unstaged diff, file that is both untracked & not ignored, etc.), with nothing printed to stdout or to stderr? If the simplest such command is complex, is there any feature request to create a simple command, possibly with options that specify what is considered dirty (staged diffs, unstaged diffs, untracked & not ignored, etc.)?

 
 
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