[0x434D53]

For an array (which are value types in go) you have the obvious element-wise equality.

For slices? Also element-wise? Even with different capacities? If the refer to the same window in the underlying array? Is there a need to copy the slice for inserting it to the map? Probably yes, because otherwise you could mutate the key from outside. But then it would be inconsistent to assignment (slices are reference types).

I have no idea how this could be done concisely.

[MichaelGG]

Yes, element wise, why anything else? Different lengths are not equal; if capacity is externally visible, then that needs to be part of the compare.

As far as the whole ownership issue, that's a bit more than just ==, isn't it? Equality was the only thing I was questioning.