Context, context, context. Scansion is not quite slave to context - the stresses and rhythms previously established, and even the meaning of the line - but, particularly in ambiguous cases, it is very much directed by context. Discussing scansion on a purely theoretical basis might be an interesting exercise on a rainy Saturday afternoon, but without putting the discussion within the framework of a specific poem, or specific lines, it's just theory and scorekeeping.
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