| bytes | Package bytes implements functions for the manipulation of byte slices. |
| 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/errors | Package errors implements functions to manipulate errors. |
| google.golang.org/protobuf/internal/flags | Package flags provides a set of flags controlled by build tags. |
| google.golang.org/protobuf/internal/strs | Package strs provides string manipulation functionality specific to protobuf. |
| io | Package io provides basic interfaces to I/O primitives. |
| math | Package math provides basic constants and mathematical functions. |
| math/bits | Package bits implements bit counting and manipulation functions for the predeclared unsigned integer 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. |
| unicode | Package unicode provides data and functions to test some properties of Unicode code points. |
| unicode/utf16 | Package utf16 implements encoding and decoding of UTF-16 sequences. |
| unicode/utf8 | Package utf8 implements functions and constants to support text encoded in UTF-8. |