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* Avoid duplicates when finding jsdoc 1. Add a cheap assert for detecting duplicates. getJSDocTags must find either [1] 0 or 1 comments or [2] the first two comments must not be identical. This does not always find duplicates for nodes with 3 or more comments, but these nodes are exceptionally rare. This assert fired for over 20 of the around 250 tests we have that retrieve JSDoc at all. So I fixed the asserts in [2] and [3]. 2. There were overlapping cases from calls to getSourceOfAssignment and getSpecialPropertyAssignment. getSpecialPropertyAssignment is too restrictive, but was in the correct location (parent vs parent.parent), so I removed the getSourceOfAssignment call and replaced the getSpecialPropertyAssignment calls with a less restrictive check. 3. When a node's parent is a PropertyDeclaration, getJSDocCOmmentsAndTags would check the parent for jsdoc. But when the *node* is a PropertyDeclaration, getJSDocCommentsAndTags would use the jsdoc from the initializer. This second case is useful to make sure that property declarations get all their jsdoc, but results in duplicates for their initializers. I couldn't think of a better fix than tracking the previous node in the recursive lookup of getJSDocCommentsAndTags, which is a little clunky. * Fix lint; remove new context parameter * Update importJsNodeModule3 with fix