CapturedType captures type projection while solving the constraint system.
During the substitution type containing captured types is approximated
to get rid of captured types and (for simple cases) replace them with corresponding type projections.
Note that Array<Array< CapturedType(out Int) >> is (over)approximated by Array<out<Array<out Int>>
See 'Mixed-site variance' by Ross Tate for details.
#KT-2570 Fixed
#KT-2872 Fixed
#KT-3213 Fixed
This is done primarily for JVM interoperability, otherwise it's impossible to
inherit from CharSequence there. On JS subSequence at the moment just invokes
substring.
#KT-5956 Fixed
This is done for JVM interoperability. There's still a member function
String.get() and an extension function "get" on CharSequence
#KT-1730 Fixed
#KT-5389 Fixed
And String.length as well.
This is done for JVM interoperability: java.lang.CharSequence is an open class
and has a function 'length()' which should be implemented in subclasses
somehow.
A minor unexpected effect of this is that String.length() is now a compile-time
constant (it wasn't such as a property because properties are not supported in
compile-time constant evaluation)
#KT-3571 Fixed
