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If a transformation should be a canonicalization is an orthogonal question to if a transformation should be implemented as a `RewritePattern` or a `fold` method. The later is an implementation detail. This patch adds a suggestion to always implement a canonicalization as a `fold` pattern if possible, as they are a restricted subset of a `RewritePattern`. This has been a common source of confusion, as to when to implement a canonicalization as a fold method or a RewritePattern.
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