fix: Explicitly handle null attribute values
#1157
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The attribute `value` can be null when a mutation observer triggers due to a removed attribute. This is currently not reflected by types and code.
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YunFeng0817
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Great catch! Thanks for your contribution.
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When an attribute is removed via
el.removeAttribute('my-attr'), this triggers the mutation observer with anullvalue for the attribute. This is currently not handled by the code/types.This PR adjusts this to handle this case explicitly.