[chimeracoder]

interface{} is different from []interface{}.

You can do a type assertion (not cast - these are different concepts) from interface{} to another type. You cannot do a type assertion on []interface{}; you have to iterate over each element and assert individually.

I agree with GP - the built-in primitives for synchronization, along with sync from the stdlib, are much cleaner once you know how to use them, and they're more idiomatic.