| fmt | Package fmt implements formatted I/O with functions analogous to C's printf and scanf. |
| google.golang.org/protobuf/internal/detrand | Package detrand provides deterministically random functionality. |
| google.golang.org/protobuf/internal/pragma | Package pragma provides types that can be embedded into a struct to statically enforce or prevent certain language properties. |
| google.golang.org/protobuf/reflect/protoreflect | Package protoreflect provides interfaces to dynamically manipulate messages. |
| io | Package io provides basic interfaces to I/O primitives. |
| reflect | Package reflect implements run-time reflection, allowing a program to manipulate objects with arbitrary types. |
| strconv | Package strconv implements conversions to and from string representations of basic data types. |
| strings | Package strings implements simple functions to manipulate UTF-8 encoded strings. |