| fmt | Package fmt implements formatted I/O with functions analogous to C's printf and scanf. |
| google.golang.org/protobuf/internal/encoding/text | Package text implements the text format for protocol buffers. |
| google.golang.org/protobuf/internal/msgfmt | Package msgfmt implements a text marshaler combining the desirable features of both the JSON and proto text formats. |
| google.golang.org/protobuf/reflect/protoreflect | Package protoreflect provides interfaces to dynamically manipulate messages. |
| 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. |