Does not create deep copy

[debasish-mihup]

https://play.golang.org/p/IYQlesIxpD1

Trying to deep copy a slice of struct but it is not working as all the copies are pointing to original and thus changing the copy affects the original

[bAngerman]

The fields of the struct must be exported in order to copy them.

see https://go.dev/play/p/q_eCLQqfUXE

[Rmaan]

This should be written in big letters in the readme 😂, it makes this library less useful as a usual use case is to copy structs from other packages with unexported fields.