What's New in Go 1.22: Reflect.TypeFor

blog.carlana.net

20 pointsPaulHoule4 comments

The explanation of the rationale for this method existing is a good primer on the footguns of go's "type system".

It could be used, in my opinion, as a litmus test for go developers: if the explanation does not make complete sense to you, then you should think twice about implementing anything substantial (basically any use of interfaces or pointers) in golang (myself included)

any use of interfaces? No way, man. Any use of reflect? Sure.

Yes, "nil interface vs nil value" is _eminently_ unintuitive and incredibly easy to get wrong:

https://dev.to/mokiat/the-dark-side-of-go-interfaces-1541

I dunno, ISTM it's like complaining that "0" != 0 in Go (it does in weakly typed languages like JS). A nil pointer and a nil interface are different types, and Go lets you call methods on nil pointers, so it would be weird if it treated nil pointers as special interface values.

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