Hi fellow Gophers
I'd like to propose that we allow type casting between `[]T` and
`[]U`, when the underlying types `T` and `U` are identical.
For example:
```
type Symbol byte
func Index(a, b []Symbol) int {
return bytes.Index(a, b)
}
```
Currently, the above code does not compile with the error:
`cannot use a (variable of type []Symbol) as []byte value in argument to
bytes.Index`
This proposal suggests to make this allowed since `Symbol` is exactly
identical to `byte`.
I am aware this has been proposed before, but was turned down since real
world needs at that time were minimal.
However, I now have a real need
<https://github.com/fumin/nag/blob/master/nag.go#L774> in my code for this
feature.
Alternatively, if this kind of slice type conversion is truly disallowed,
can anyone suggest a better way of writing the above function that
maintains its readability and performance?
Thanks
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