This annotation marks the standard library API that is considered experimental and is not subject to the general compatibility guarantees given for the standard library: the behavior of such API may be changed or the API may be removed completely in any further release.
Beware using the annotated API especially if you're developing a library, since your library might become binary incompatible with the future versions of the standard library.
Any usage of a declaration annotated with
@ExperimentalStdlibApi must be accepted either by
annotating that usage with the OptIn annotation, e.g.
or by using the compiler argument