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Added Asset Conversion swap*_credit functions #14716

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Added Asset Conversion swap*_credit functions #14716

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PatricioNapoli
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Part of the effort of Paying XCM Execution Fees with foreign assets

This PR attempts to add swap operations that do not require an origin or destination for the funds (and thus will not mutate global state), and only operates within Imbalances, proper for usage within XCM.

  • Proper imbalances types for swap_exact and swap_for_exact
  • Implement do_swap_credit and probably transfer_credit
  • Expand the tests to use the new swap*_credit functions

@PatricioNapoli PatricioNapoli added A0-please_review Pull request needs code review. B0-silent Changes should not be mentioned in any release notes C1-low PR touches the given topic and has a low impact on builders. D5-nicetohaveaudit ⚠️ PR contains trivial changes to logic that should be properly reviewed. labels Aug 4, 2023
@PatricioNapoli PatricioNapoli added A3-in_progress Pull request is in progress. No review needed at this stage. and removed A0-please_review Pull request needs code review. labels Aug 9, 2023
muharem
muharem reviewed Aug 10, 2023
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@PatricioNapoli PatricioNapoli marked this pull request as ready for review August 14, 2023 14:02
@PatricioNapoli PatricioNapoli requested review from a team August 14, 2023 14:02
@PatricioNapoli PatricioNapoli added A0-please_review Pull request needs code review. and removed A3-in_progress Pull request is in progress. No review needed at this stage. labels Aug 14, 2023
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The CI pipeline was cancelled due to failure one of the required jobs.
Job name: test-linux-stable-int
Logs: https://gitlab.parity.io/parity/mirrors/substrate/-/jobs/3435549

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A0-please_review Pull request needs code review. B0-silent Changes should not be mentioned in any release notes C1-low PR touches the given topic and has a low impact on builders. D5-nicetohaveaudit ⚠️ PR contains trivial changes to logic that should be properly reviewed.
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@PatricioNapoli @paritytech-cicd-pr @muharem