Make miniscript GetWitnessSize accurate for tapscript #28651
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…cript b228108 miniscript: make GetWitnessSize accurate for tapscript (Pieter Wuille) 8be9851 test: add tests for miniscript GetWitnessSize (Pieter Wuille) 7ed2b2d test: remove mutable global contexts in miniscript fuzzer/test (Pieter Wuille) Pull request description: So far, the same algorithm is used to compute an (upper bound on) the maximum witness size for both P2WSH and P2TR miniscript. That's unfortunate, because it means fee estimations for P2TR miniscript will miss out on the generic savings brought by P2TR witnesses (smaller signatures and public keys, specifically). Fix this by making the algorithm use script context specification calculations, and add tests for it. Also included is a cleanup for the tests to avoid mutable globals, as I found it hard to reason about what exactly was being tested. ACKs for top commit: achow101: ACK b228108 darosior: ACK b228108 Tree-SHA512: e4bda7376628f3e91cfc74917cefc554ca16eb5f2a0e1adddc33eb8717c4aaa071e56a40f85a2041ae74ec445a7bd0129bba48994c203e0e6e4d25af65954d9e
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So far, the same algorithm is used to compute an (upper bound on) the maximum witness size for both P2WSH and P2TR miniscript. That's unfortunate, because it means fee estimations for P2TR miniscript will miss out on the generic savings brought by P2TR witnesses (smaller signatures and public keys, specifically).
Fix this by making the algorithm use script context specification calculations, and add tests for it. Also included is a cleanup for the tests to avoid mutable globals, as I found it hard to reason about what exactly was being tested.