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net: LookupPort("tcp", "123") no longer returns 123 #12263
This broke because the cgo-based lookup did accept "123" but the Go-based lookup does not. This means the behavior was at best inconsistent before, but it does make sense that you should be able to look up tcp/80 in addition to tcp/http.
If we have a more serious problem for a 1.5.1 this would be a candidate for an add-on.