Another big area that is lacking is Go makes it so hard if you want to use something other than a primitive as a hash key (Rust is guilty of this as well, mind you). This is something that should come out of the box in any modern language in my opinion.
Seems easy enough to me? The only annoyance is if a third party type didn't implement Hash, but you can solve that with a manual implementation instead of a derive.
ding ding ding! This has been a problem for me a number of times. The quick workaround is pray that it implements Debug and in a reasonable way and take the hash of the string instead
not if it doesn't have equailty defined. Then you have to define it. Oh, and it's an AST node someone at X company wrote and there are 100+ node types. Have fun!
In crystal there is a reasonable data-based default hash implementation that you can just rely on.
The map key type can be anything for which `==` is defined. This includes structs for which `==` is defined for every field. Composite keys etc are trivial.
