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e4dbd1aa7d
Moved from https://github.com/polkadot-fellows/xcm-format/pull/59. This RFC proposes a framework for specifying "execution hints", much like [window hints in GLFW](https://www.glfw.org/docs/3.3/window_guide.html#window_hints). The first one is `AssetClaimer`, that allows the user to specify who can claim trapped assets resulting from that program execution. That was an instruction already approved and targeted at XCMv5. This RFC proposes to move it to this hints mechanism. Another potential hint is `LeftoverAssetsDestination`, which, when set, would send all leftover assets to a particular location instead of trapping. This additional hint is not covered by the RFC. It could be proposed in a new one.