There doesn’t seem to be anything online about CastChecked.
Can someone explain for future readers?
Probably an internal function to check if cast function fails or succeeds
All you have to do is
AMyClass* cl = Cast<AMyClass>(Other);
and unreal does the asserts behind your back 
CastChecked is exactly what it says, it’s a checked cast. It’s the equivalent of:
ptrA = Cast< type >( ptrB );
check( ptrA != nullptr );
It’s not an internal function but you do have to be pretty sure that the cast is going to succeed.
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