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Alan Donovan authored
This function is absolutely critical for clients such as exp/ssa, and too complex for clients to duplicate. As with CL 7200046, gri expressed in the doc below [gophers only] before going on leave that he intended to expose such a predicate, though his wording suggests as an interface method of Type rather than a standalone function. (My preference is for binary methods to be standalone; see "On Binary Methods", Kim Bruce, 1995). In any case if he wishes to move it that's easily accommodated by clients. https://docs.google.com/a/google.com/document/d/1-DQ4fxlMDs9cYtnkKhAAehX6MArjOQyJsRXp-6kiJLA/edit#heading=h.k3bwja7xony9 R=iant, gri, iant CC=golang-dev https://golang.org/cl/7203051
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