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It's purpose is to prevent `advanceNode` from changing qualities when we've already gotten some liquidity at a better quality.","created_at":"2016-05-18T14:49:41Z","updated_at":"2016-05-18T14:49:41Z","html_url":"https://github.com/ripple/rippled/pull/1705#discussion_r63717319","pull_request_url":"https://api.github.com/repos/ripple/rippled/pulls/1705","_links":{"self":{"href":"https://api.github.com/repos/ripple/rippled/pulls/comments/63717319"},"html":{"href":"https://github.com/ripple/rippled/pull/1705#discussion_r63717319"},"pull_request":{"href":"https://api.github.com/repos/ripple/rippled/pulls/1705"}}},"pull_request":{"url":"https://api.github.com/repos/ripple/rippled/pulls/1705","id":70344964,"html_url":"https://github.com/ripple/rippled/pull/1705","diff_url":"https://github.com/ripple/rippled/pull/1705.diff","patch_url":"https://github.com/ripple/rippled/pull/1705.patch","issue_url":"https://api.github.com/repos/ripple/rippled/issues/1705","number":1705,"state":"open","locked":false,"title":"Payment bug fixes","user":{"login":"seelabs","id":5853458,"avatar_url":"https://avatars.githubusercontent.com/u/5853458?v=3","gravatar_id":"","url":"https://api.github.com/users/seelabs","html_url":"https://github.com/seelabs","followers_url":"https://api.github.com/users/seelabs/followers","following_url":"https://api.github.com/users/seelabs/following{/other_user}","gists_url":"https://api.github.com/users/seelabs/gists{/gist_id}","starred_url":"https://api.github.com/users/seelabs/starred{/owner}{/repo}","subscriptions_url":"https://api.github.com/users/seelabs/subscriptions","organizations_url":"https://api.github.com/users/seelabs/orgs","repos_url":"https://api.github.com/users/seelabs/repos","events_url":"https://api.github.com/users/seelabs/events{/privacy}","received_events_url":"https://api.github.com/users/seelabs/received_events","type":"User","site_admin":false},"body":"This PR fixes three bugs in payments:\r\n\r\n1) Owner count could decrease while evaluating a strand, causing different behavior in forward passes and reverses passes. The fix treats a decreased owner count like a deferred credit.\r\n\r\n2) In some situations, deferred credits could cause an XRP balance to be calculated as negative, triggering some asserts.\r\n\r\n3) When XRP is used as a bridge currency, a path could be falsely marked as dry. This happens when the XRP/XXX offer recursively checks the XXX/XRP offer and the XXX/XRP offer could not satisfy the request in a single call.\r\n\r\n@scottschurr @nbougalis 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