[BUG] Do not encode unexported fields

[rishavmnr]

Is there an existing issue for this?

• I have searched the existing issues

Current Behavior

If there are unexported fields in a struct, it throws a panic.
Context: I'm upgrading the version from 1.2.1 to 1.4.1

reflect: reflect.Value.Set using value obtained using unexported field\n\ngoroutine 447 [running]:\nruntime/debug.Stack()\n

Expected Behavior

No panic.

Steps To Reproduce

In the destination struct, have some unexported fields, maybe pointers.

Anything else?

No response