dcdpr / jp / 20601200953

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fix(tombmap): prevent dangling pointer in `Mut` wrapper (#351)

The `Mut::new_untracked` constructor was previously creating a
`ptr::NonNull` from a temporary `HashSet` created on the stack. This
resulted in a dangling pointer that would cause undefined behavior when
accessed during dereferencing or when calling `get_mut`.

The `modified` field in `Mut` is now an `Option`. When created via
`Mut::new_untracked`, it is set to `None`, and modification tracking is
skipped. `IterMut` continues to provide the pointer to its internal
tracking set to ensure that modifications via iterator are still
correctly captured.

Signed-off-by: Jean Mertz <git@jeanmertz.com>

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