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db260ea2f9
Moved from https://github.com/polkadot-fellows/xcm-format/pull/53. The idea is to extend the current XCM fee mechanism to support in principle delivery fees, but potentially other types of fees as well. This is accomplished by having two additions: - `PayFees` instruction - A `fees` register, where fees go and stay there until the end of execution. Crucially, separate from the `holding` register --------- Co-authored-by: Adrian Catangiu <adrian@parity.io>