One weight estimator for script types and size hints

<p>A coin selector prices an output before anyone tells it what kind of output it is. A caller that tracks script types wants the witness discount to land in the fee; a caller holding nothing but a byte count still wants a number. So you write two fee calculators, one per description, and the two of them disagree by a byte at the edges. A byte at the edges is how you ship a transaction that will n

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