Try to remove an instrumentation wrapper created by this monitor.
If the function passed to unwrap is not a wrapper created by this
monitor, then we will do nothing.
Notice that some wrappers may not be unwrappable. For example, if other
monitors have applied their own wrappers, then it will be impossible to
unwrap them because their wrappers will have captured our wrapper.
So it is important that entry points are unwrapped in the reverse
order that they were wrapped.
| Parameters | | fn | Function | | A function to unwrap.
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| Returns | Function | The unwrapped function, or fn if it was not
a wrapped function created by this monitor.
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