Imports of package encoding

PathSynopsis
google.golang.org/grpc/internal/grpcutilPackage grpcutil provides utility functions used across the gRPC codebase.
google.golang.org/grpc/memPackage mem provides utilities that facilitate memory reuse in byte slices that are used as buffers.
ioPackage io provides basic interfaces to I/O primitives.
stringsPackage strings implements simple functions to manipulate UTF-8 encoded strings.